How to calculate attack bonus

Attack Bonuses in 5e depend on: Example of How Attack Bonuses Work. How to increase Attack Bonuses. Do Spellcasters get Attack Bonuses? How to Calculate Attack Bonuses. Attack Rolls Vs. Damage Rolls. Attack Bonuses Vs. Proficiency Bonuses. Attack Bonuses for Finesse Weapons. Summary of Attack Bonuses in Dnd 5e: Attack Bonuses FAQ.

Benefits []. Base Attack Bonus serves several roles in DDO: It is added to all attack rolls with any weapon, including bare hands.; It determines the number of attacks in your attack sequence.; It is capped at 25 since U56; It determines player attack speed: . For melee weapons, attack speed increases at BAB 1, 3, 5, 10, 15, 20, and 25 ()For …Aug 27, 2021 · By level one, their proficiency bonus would be a +2. Thus, the player rolls a 1d20 for their attack roll and gets a 12. Their attack roll would then be 16, since 12 (1d20) + 2 (Strength modifier) + 2 (proficiency bonus). 16 reaches the target’s AC, so it hits. 5e Longbow Properties. It has the following properties: 150/600 ft. range ... Yes. You are correct - melee weapons use strength (even if thrown), ranged weapons use dexterity. On slight complication is that weapons with the Finesse characteristic use strength or dexterity at the users choice (usually whichever is better). If the person is proficient with the weapon they also add their proficiency bonus.The bonus attack is just your standard monk unarmed strike. This means the Martial Arts ability that allows the addition of either DEX or STR to unarmed strike attacks and damage rolls can be used. Normal attack roll: 1d20 + proficiency bonus + (STR or DEX). At level 1 (damage scales with level), its damage is 1d4+ (STR or DEX).There are four ways to buy up your attack bonus. If you buy the relevant Attribute you boost all attacks, defenses, and skills using that attribute. If you buy the Close or Ranged Combat Advantage, you get a +1/rank of the Advantage bonus to all Close/Ranged attacks. If you buy the Close/Ranged Combat skill (which requires a subskill ...May 2, 2023 · Understanding how to calculate your attack bonus is essential for any player looking to improve their combat effectiveness. In this article, we will provide a step-by-step guide on how to calculate the attack bonus, as well as some examples and tips to help you master the art of combat in D&D 5e. Step 1: Determine Your Proficiency Bonus. Before calculating your spell attack bonus, you need to find out your character’s proficiency bonus. This value depends on your character’s level and represents their expertise in certain skills and abilities. As you gain experience and advance in levels, your proficiency bonus increases.

There are four ways to buy up your attack bonus. If you buy the relevant Attribute you boost all attacks, defenses, and skills using that attribute. If you buy the Close or Ranged Combat Advantage, you get a +1/rank of the Advantage bonus to all Close/Ranged attacks. If you buy the Close/Ranged Combat skill (which requires a subskill ...Each creature has a base attack bonus and it represents its skill in combat. As a character gains levels or Hit Dice, his base attack bonus improves. When a creature's base attack bonus reaches +6, +11, or +16, he receives an additional attack in combat when he takes a full-attack action (which is one type of full-round action—see Combat). How do I calculate base attack bonus BAB. You take the max numbers. From each of the class lines that you have. And add them. So if youre solarian 3/mystic1, you get +3 from solarian, +0 from mystic. It’s pretty common for new players to mistakenly add the BABs together from each level; I blame the plus symbol added to everything in TTRPGs. Edit: So just in case anyone was wondering, the ratio goes into Bennett’s base attack and then that number goes into the active character’s base attack and then other stats scale base off that. (The reason I was getting the wrong answer was because I wasn’t factoring in the 18% from the set bonus of Gladiator’s Finale) 6.Spell Attack Bonus Calculation Example. Using an example, let's see how to work out the Spell Attack Bonus for a Level 1 Warlock. Here's the calculation formula again.Quickly calculate your barbarian attack and damage bonuses. Kassoon. Barbarian Damage Calculator for D&D. Attack Bonus Damage Bonus; 2: Level . Other Levels . 3 ...

You roll the damage die or dice, add any m odifiers, and apply the damage to your target. Magic weapons, special abilities, and other factors can grant a bonus to damage. When attacking with a weapon, you add your ability modifier—the same modifier used for the attack roll—to the damage. The description of the Shillelagh cantrip says:. The wood of a club or quarterstaff you are holding is imbued with nature’s power. For the duration, you can use your spellcasting ability instead of Strength for the attack and damage rolls of melee attacks using that weapon, and the weapon's damage die becomes a d8. The ability score roll. When you roll ability scores, the standard method is to roll 4d6, discard the lowest result, then add up the other three results. This gives results between 3 and 18. I don't see any evidence of you discarding the lowest roll, but let's suppose for a moment that you really rolled a 16 as the sum of your three highest dice.To determine your modifier, you take whatever score you have, subtract 10, and divide by 2. Spell save DC is 8 + spellcasting modifier + proficiency bonus. Proficiency bonus increases with level, starting with +2 at level 1. Spell attack bonus is your spellcasting modifier + proficiency bonus. You add that to whatever you rolled on a d20 to ...Almost nothing in the game changes your BAB for any reason. 1. The rules for combat maneuvers explain how to calculate your combat maneuver bonus as well as combat maneuver defense. Unless a feat or class feature or something changes things (and some do), the formulas are. CMB CMD = BAB + Str +msize = 10 + BAB + Str + Dex +msize +mmisc C M B ...The standard rule of attacks is that hitting requires you to follow this formula: Success: (Total sum of: 1d20 + any modifiers) >= Opponent's Armor Class. Failure: (Total sum of: 1d20 + any modifiers) < Opponent's Armor Class. If you hit, you deal damage. The types of modifiers you use in rolling to hit and the type of damage you deal depends ...

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If the roll + attack bonus > enemy AC, you hit. It's actually not if you roll higher than AC, it's if you equal or higher. Just like when you need to make a DC, if you roll equal or higher, you make it. Quick edit: And the only time your weapon will be relevant is probably on opportunity attacks, because you can cast cantrips as much as you ...In today’s digital landscape, the threat of ransomware attacks looms large. These malicious cyber-attacks can cause significant damage to businesses, with one of the primary target...Bombs are a ranged weapon. So the attack roll will look like this. Dex Modifier + Proficiency + Level. When they get other types of bonuses then include those. So at level 1 it should look like this: +3 (with 16 dex) + 2 (trained) + 1 (level) = +6 to attack roll. Note: Even though the bomb is thrown it does not have the thrown trait.Though many people use the terms interchangeably, the experience of anxiety is not the same as a panic attack, though they can be related. Anxiety is an emotional state, brought on...Nov 15, 2020 ... Illustrations for how to calculate Spell Attack Bonuses and Spell DCs, especially when the character is able to cast spells from multiple ...

Aug 27, 2021 · By level one, their proficiency bonus would be a +2. Thus, the player rolls a 1d20 for their attack roll and gets a 12. Their attack roll would then be 16, since 12 (1d20) + 2 (Strength modifier) + 2 (proficiency bonus). 16 reaches the target’s AC, so it hits. 5e Longbow Properties. It has the following properties: 150/600 ft. range ... 1. Yes. Weapon focus gives its bonus to all attacks with that weapon. Strength gives its bonus to all strength-based attacks (which is all regular attacks unless you use weapon finesse or some other odd ability). So with your preferred weapon it's going to be +10/+5. If you pick up a different kind of weapon, it's +9/+4.Attack Bonus Ratio on Bennett's Ult. Good day bennett mains, is the attack bonus ratio on bennys ult based on his attack or the attack of the one inside the ult? It’s based on his attack, and only his base attack (level plus weapon) so …Base Attack Bonus (BAB) defines a creature's basic ability to land a damaging hit on an enemy if no other bonuses or modifiers would play a role. Every six points of Base Attack Bonus will allow the character to perform a second attack when attacking as a Full-Round Action. This second attack is made at an Attack Bonus five points lower than the first …A Pokemon which has the Technitian ability gets x1.5 boosted attack power for all moves used which have an attack power of 60 or less (so a move with 60 attack power will actually have 90 attack power). STAB (Same type attack bonus) gives a 50% boost to damage, assuming the attack has the same type as the Pokemon using it (so a Grass …Yes, melee touch attack spells are base attack + strength and ranged touch attacks are base attack + dex. You can also take weapon focus (melee touch) to get another +1 to melee touch attacks, weapon focus (ray) for +1 to ranged, and point blank shot to get another +1 to ranged touch (within 30 feet). So in general, yes, modifiers apply to ...How to Calculate CR for Homebrew Monsters. ... Attack Bonus, Damage Per Round, and Save DC. But there’s a bit more to the formula than just taking the numbers directly from the table. Using the table, you can calculate your monster’s CR by taking the averages of its actual stats. Using this method, an enemy has two CR ratings, an …For example, as you said above, a short sword uses 1d6, plus whatever modifiers (usually the strength modifier for melee weapons, sometimes magical bonuses, etc.) That's the amount of damage the attack does. That damage is subtracted from the creature's Hit Points. When they attack the PC, the same thing happens. Repeat until …Learning to determine the attack bonus is easy once you get the hang of it. To determine attack bonus, the formula is. Attack Roll = Base Attack Bonus + ability modifier + weapon’s enhancement bonus + other modifiers. It is good to remember that the only thing you should worry about is Ability Modifiers and Proficiency.

magic weapon bonus: a +X weapon gives you +X to your damages (this bonus also apply on the attack roll) On top of that some special effects can add other damages, like sneak attack dice, weapon with the bane property or a Paladin smiting evil. Example: Bob the goblin has a strength of 9 and a +3 one-handed scimitar.

In that, you can see the problem areas exist mostly during levels 5-6 and then 10-18, shown by comparing the martial attack bonus versus spell attack bonus. That's when the difference between attack roll bonuses of martials and casters is greater than 1. I think 1 is an acceptable difference.Using this we can now predict what AR will be at different STR values. If we wanted to figure out what AR would be at 40 STR, we would use 0.75 as saturation (as 40 in a stat is 75% of the maximum bonus): FinalAR = BaseAR + (BaseAR * WeaponMod * Saturation) FinalAR = 266 + (266 * 0.7669 * 0.75) FinalAR = 266 + 153.In today’s digital landscape, ransomware attacks have become a growing concern for businesses of all sizes. One prominent company that has faced its fair share of security breaches...1 Answer. Sorted by: 19. Your attack bonus is +7. The Martial Arts feature states: You can use Dexterity instead of Strength for the attack and damage rolls of your …The Player's Handbook, Chapter 9, states about attack rolls:. The ability modifier used for a melee weapon attack is Strength. A bit later on it also states about melee attacks:. Instead of using a weapon to make a melee weapon attack, you can use an unarmed strike: a punch, kick, head-butt, or similar forceful blow (none of which count …It was another busy week for the SPAC market with numerous deal announcements and rumored deals. Benzinga's "SPACs Attack" covered i... It was another busy week for t...Every 40 seconds, a person in this country has a heart attack. Catching heart attack signs and symptoms as early as possible can be lifesaving. Let’s take a closer look at how to s...If you check the sorcerer's Spellcasting rules, it tells you how to calculate your spell save DC and your spell attack modifier. Spell save DC = 8 + your proficiency bonus + your Charisma modifier. Spell attack modifier = your proficiency bonus + your Charisma modifier. Your character's proficiency bonus is included in both formulas. Cantrips ...

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How do I calculate base attack bonus BAB. You take the max numbers. From each of the class lines that you have. And add them. So if youre solarian 3/mystic1, you get +3 from solarian, +0 from mystic. It’s pretty common for new players to mistakenly add the BABs together from each level; I blame the plus symbol added to everything in TTRPGs. Never miss a mark again! Learn how to calculate your Attack Bonus in 5E, maximizing your hits and making each swing or spell count. The standard rule of attacks is that hitting requires you to follow this formula: Success: (Total sum of: 1d20 + any modifiers) >= Opponent's Armor Class. Failure: (Total sum of: 1d20 + any modifiers) < Opponent's Armor Class. If you hit, you deal damage. The types of modifiers you use in rolling to hit and the type of damage you deal depends ...In today’s digital age, the threat of ransomware attacks is becoming increasingly prevalent. Cybercriminals are constantly devising new ways to infiltrate systems and hold valuable...To determine your modifier, you take whatever score you have, subtract 10, and divide by 2. Spell save DC is 8 + spellcasting modifier + proficiency bonus. Proficiency bonus increases with level, starting with +2 at level 1. Spell attack bonus is your spellcasting modifier + proficiency bonus. You add that to whatever you rolled on a d20 to ...To calculate your actual attack bonus for a specific attack type, you then add any other modifiers involved to the BAB, such as for the stat involved (Str for melee or Dex for missile, generally). In your specific case, assuming you are level 1, your BAB will be +1. Your attack bonus with the melee weapons (Axe and Great Club) will be your BAB ...I've got that same issue and it's an issue that happens from time to time, but it typically sorts itself out be the time they get done with the spawning process. This month they're just having some technical difficulties. Erik Keith Paizo Customer Service Algorithm. Mar 13, 2014, 06:53 pm.If the roll + attack bonus > enemy AC, you hit. It's actually not if you roll higher than AC, it's if you equal or higher. Just like when you need to make a DC, if you roll equal or higher, you make it. Quick edit: And the only time your weapon will be relevant is probably on opportunity attacks, because you can cast cantrips as much as you ... Additionally, the proficiency bonus represents your experience from a role playing viewpoint, and your power curve from a game design viewpoint. Example: Suppose you are playing the druid class in D&D 5e, if you are at +10 ability modifier, your proficiency bonus is +2, find your attack bonus. Therefore, the attack bonus is 12. To calculate attack damage, you roll 4d8 (four 8-sided dice). Melee Spell Attack of Opportunity. A combat spell attack of opportunity is a “bonus” attack you get when a hostile creature leaves your character’s reach. Perhaps an injured enemy is running away or trying to disengage. ….

Attack bonuses are bonuses that increases your chance of successfully hitting an opponent in combat. Your attack bonus with a melee weapon is: Base attack bonus + Strength modifier + size modifier Your attack bonus with a ranged weapon is: Base attack bonus + Dexterity modifier + size modifier + range penalty A base attack bonus is an …The role of the Spell Attack Bonus becomes apparent when you cast a spell that necessitates an attack roll, such as Fire Bolt or Inflict Wounds. When you execute such a spell, you roll a 20-sided die (a d20), add your Spell Attack Bonus to the outcome, and match it against the target’s Armor Class (AC). If your total meets or surpasses their ...Apr 20, 2020 · So say you have a +3 to strength it adds proficency bonus and gives you an attack modifier of +5 to hit. When your stat or proficency bonus increase so will the attack modifier. Damage is your weapons damage dice plus the ability modifier associated with the attack, but not the proficency bonus. Hope this helps. Spell Attack Bonus Calculator Exemplary. Using an example, let’s see how to work out the Spell Attacking Bonus required a Level 1 Warlock. Here’s the calculation formula new. Spell Attack bonus = Spellcasting ability modifier + Proficiency bonus. First, we discover out what magician use toward power their spells. It’s Charisma.To calculate attack damage, you roll 4d8 (four 8-sided dice). Melee Spell Attack of Opportunity. A combat spell attack of opportunity is a “bonus” attack you get when a hostile creature leaves your character’s reach. Perhaps an injured enemy is running away or trying to disengage.%external/additional bonus damage sources = outside sources of damage that don't fit any of the other categories. Such examples is the spear that gives +80% damage against slimes, +35% normal attack damage from 4 piece gladiator set, +60% damage from slingshot or rust.So our spell attack bonus is 2 + 2 = 4. We’d write +4 in the Spell Attack Bonus box on our character sheet. Now, every time we roll to attack with a spell, we add +4 to our d20 roll. If our roll plus our spell attack bonus meets or beats the AC of our target, it succeeds.Determine the spell attack roll with the following formula. Spell attack roll result = d20 roll + ability modifier used for spellcasting + proficiency bonus + other bonuses + penalties. If you have the ability to cast spells, you’ll have a proficiency rank for your spell attack rolls, so you’ll always add a proficiency bonus. Attack Rolls. SourceCore Rulebook pg. 278 4.0 When making an attack roll, determine the result by rolling 1d20 and adding your attack modifier for the weapon or unarmed attack you’re using. Modifiers for melee and ranged attacks are calculated differently. Melee attack modifier = Strength modifier (or optionally Dexterity for a finesse weapon ... Nov 15, 2020 ... Illustrations for how to calculate Spell Attack Bonuses and Spell DCs, especially when the character is able to cast spells from multiple ... How to calculate attack bonus, In today’s digital landscape, ransomware attacks have become increasingly prevalent and can wreak havoc on businesses of all sizes. These malicious attacks can encrypt your website..., The intent is that the druid uses the bonus in the beast's stat block for any proficiency the druid lacks. Unless the druid is proficient with claws, bites, or other types of the creature's attacks, it seems that there is no cause to apply the druid's proficiency bonus. Remember, the lack of an explicit "no" does not translate to a "yes". If ..., Aug 1, 2023 ... Link to ultimate epic tierlist - https://postimg.cc/rKV0V8QL Link for how to gear your heroes - https://youtu.be/S8SEP08HNZ0 Link for best ..., Either arm can go numb during a heart attack, but it is more frequently the left arm. Numbness alone is not a sign of a heart attack and can be caused by a number of other conditio..., A Fighter making a melee attack with a longsword would use the following to determine their Attack Bonus: Str Mod + Proficiency = Attack Bonus. A Ranger making a ranged attack with a longbow would use the following to determine their Attack Bonus: Dex Mod + Proficiency = Attack Bonus, The exact bonuses that apply depend on the nature of the attack, but they all follow this general formula: 1d20 + Ability Modifier Bonus + Proficiency (if applicable) + …, Additionally, the proficiency bonus represents your experience from a role playing viewpoint, and your power curve from a game design viewpoint. Example: Suppose you are playing the druid class in D&D 5e, if you are at +10 ability modifier, your proficiency bonus is +2, find your attack bonus. Therefore, the attack bonus is 12., Sep 26, 2017 · Base number for Save DC. The spell save DC is 8 + proficiency bonus + intelligence modifier. At level 1 with a Int of say 15 (which mod is +2), you'd have 8 + 2 + 2 = 12. For attack there isn't a base. Your spell Attack is your intelligence modifier + proficiency bonus. Using the the example of a level 1 with 15 Int, you get 2 + 2 = 4. Share. , Roll the weapon or unarmed attack’s damage die and add the relevant modifiers, bonuses, and penalties to determine the amount of damage you deal. Calculate a damage roll as follows. Melee damage roll = damage die of weapon or unarmed attack + Strength modifier + bonuses + penalties. Ranged damage roll = damage die of weapon + Strength ..., Here’s how to calculate your attack bonus: Non-Finesse Melee Weapon: Strength Modifier + Proficiency Bonus (if proficient with the weapon) ... Spell Attack Bonus. Your spell attack bonus is equal to your spellcasting ability modifier plus your proficiency bonus. So if your class uses Wisdom as their spellcasting ability and has a +3 Wisdom ..., Attack Bonuses in 5e depend on: Example of How Attack Bonuses Work. How to increase Attack Bonuses. Do Spellcasters get Attack Bonuses? How to Calculate Attack Bonuses. Attack Rolls Vs. Damage Rolls. …, In this case, your Base Attack Bonus for 8 levels in Rogue is +6/+1, and your two fighter levels net you +2. All you need to do is add them together, for a total of +8/+3. Note that the +2 from fighter adds to both attacks. Mind that you gain new attacks at certain levels of base attack bonus indipendent of your classes., 1. Yes. Weapon focus gives its bonus to all attacks with that weapon. Strength gives its bonus to all strength-based attacks (which is all regular attacks unless you use weapon finesse or some other odd ability). So with your preferred weapon it's going to be +10/+5. If you pick up a different kind of weapon, it's +9/+4., And for damage: When attacking with a weapon, you add your ability modifier—the same modifier used for the attack roll—to the damage. This: From RAW: Your attack roll is 1d20 + your ability modifier + your proficiency bonus if you're proficient with the weapon you’re using. And for damage:, Yes, there are several sources that use a mental ability score modifier for spell attack rolls. Magus Arcana: Arcane Accuracy is a limited resource that allows a magus to add their Int modifier to all attack rolls for one round, which includes spell attack rolls. If the magus has the Eldritch Scion archetype, they use their Cha instead of Int for this …, The attack rules are similar for all character classes: proficiency + ability modifier. melee attacks: prof + STR. ranged attacks: prof + DEX. spell attacks: prof + (spellcasting ability mod) Which ability is your spellcasting ability depends on your class. Note that for melee and ranged attack, you only add proficiency bonus if you are ..., To determine the total base save bonus or base attack bonus of a multiclass character, calculate the fractional values for each of the character’s classes using the table and add them together. This rule affects only multiclass characters, and such characters will have a number of attacks depending on their combined base attack bonuses from ..., A myocardial infarction, commonly known as a heart attack, occurs when the blood supply to the heart is interrupted. With this in mind, understanding various symptoms associated wi..., You can add their proficiency bonus to attacks made with any of those. But if you pick up the Fighter’s dropped battleaxe – something you’re not trained to use – no proficiency bonus for you. Weapon attack roll with proficient weapon = d20 + proficiency bonus. Weapon attack roll with non-proficient weapon = d20., The stats blocks for published monsters will already be applying the monster's proficiency bonus where appropriate. For example, the CR1/2 Orc has a greataxe attack: Greataxe. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 9 (1d12 + 3) slashing damage. That +5 attack bonus includes the Orc's +3 Strength modifier and their +2 ... , For the purpose of these attacks, the monk's base attack bonus from his monk class levels is equal to his monk level. This makes the attack formula: Monk Level + Str Mod - 2 + 1d20. The class table combines Monk Level and the -2 penalty into the column Flurry of Blows Attack Bonus. Giving you the formula: Flurry of Blows Attack Bonus + Str Mod ..., Never miss a mark again! Learn how to calculate your Attack Bonus in 5E, maximizing your hits and making each swing or spell count. , So our spell attack bonus is 2 + 2 = 4. We’d write +4 in the Spell Attack Bonus box on our character sheet. Now, every time we roll to attack with a spell, we add +4 to our d20 roll. If our roll plus our spell attack bonus meets or beats the AC of our target, it succeeds., When attacking with a weapon, your bonus to hit is equal to your proficiency modifier plus your ability modifier (so at level 1, your proficiency modifier is …, Super simple formula is Proficiency Bonus + Ability Modifier = Attack Bonus. In the case of a rogue using a scimitar in your main hand your Proficiency Bonus is based on your level, and your Ability Modifier comes from either your strength or dexterity as scimitars have the keyword finesse. Note that you cannot add your Ability Modifier to the ..., The ability modifier used for a melee weapon attack is Strength, and the ability modifier used for a ranged weapon attack is Dexterity. Weapons that have the finesse or thrown property break this rule. So yes, for a character with 15 Dexterity (i.e., +2 modifier), they would normally calculate the crossbow's damage roll as 1d8+2., It was another busy week for the SPAC market with numerous deal announcements and rumored deals. Benzinga's "SPACs Attack" covered i... It was another busy week for t..., Ranged attack rolls use Dexterity as their ability modifier. Ranged attack roll result = d20 roll + Dexterity modifier + proficiency bonus + other bonuses + penalties. When attacking with a weapon, whether melee or ranged, you add your proficiency bonus for the weapon you're using. Your class determines your proficiency rank for various weapons. , The bonuses an item provides are placed into three different categories: Attack bonus, Defence bonus, and Other bonuses. These bonuses, in addition to level of the player's relevant combat skills and the attack style used, are used to calculate both the damage dealt and received during combat, and the likelihood of an attack being successful., May 2, 2023 · Understanding how to calculate your attack bonus is essential for any player looking to improve their combat effectiveness. In this article, we will provide a step-by-step guide on how to calculate the attack bonus, as well as some examples and tips to help you master the art of combat in D&D 5e. , Bombs are a ranged weapon. So the attack roll will look like this. Dex Modifier + Proficiency + Level. When they get other types of bonuses then include those. So at level 1 it should look like this: +3 (with 16 dex) + 2 (trained) + 1 (level) = +6 to attack roll. Note: Even though the bomb is thrown it does not have the thrown trait., So for you, your rolls go like this; ATTACK ROLLS: Longbow: 1d20+proficiency+DEX modifier. Hand Axe: 1d20+proficiency+STR modifier and the same again for your bonus action attack. Club: 1d20+proficiency+STR modifier. DAMAGE ROLLS: Longbow: 1d8+DEX modifier. Hand Axe: 1d6+STR modifier and just 1d6 for your bonus action attack., The same basic system is used in D&D 3.x. 20 - your base THAC0 became your Base Attack Bonus, and your strength bonus adds to your base attack bonus. If you subtract a 3.x attack bonus from 20, you get your THAC0 from AD&D (roughly, there's no direct conversion possible between the two editions).