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Base Attack Bonus

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The Base Attack Bonus (or BAB) is a number that represents a character or monster's skill at fighting that comes purely from his or her profession, training, and personal experience. BAB is an important part of your total attack bonus. It also affects your attack speed.

Benefits[edit]

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 determines player attack speed:
    • For melee weapons, attack speed increases at BAB 1, 3, 5, 10, 15, 20, and 25 (MrCow)
    • For bows and thrown, attack speed increases with each point of BAB, and it grows much faster than for melee. (MrCow)
  • Several combat-related feats require a minimum BAB to unlock.
  • The Physical Resistance Rating that you receive for wearing armor scales with BAB.

Progression[edit]

The BAB progression for players is based on their class (for creatures, on their HD), and follows one of the three following progressions:

Fractions are dropped (rounded down). To calculate BAB of a multiclass character, first round down the BAB for each class, then add numbers together. For example, a level 3 character with one level of rogue, one level of bard, and one level of sorcerer has a BAB of 0 (floor(0.5) + floor(0.75) + floor(0.75)). A level 9 character with 1 rogue and 8 barbarian levels has a BAB of 8 (8 + floor(0.75)).

Multiple Numbers on Class Pages[edit]

The BAB column on class spreadsheets indicate multiple numbers. The first number listed is the Base Attack Bonus. Subsequent numbers indicate the attack bonus the character achieves on various stages of their attack sequence.

Increasing base attack bonus[edit]

Certain spells and abilities make your base attack bonus equal to character level:

Additionally, Flurry of Blows allows a centered monk to receive a full BAB progression for all monk levels, rather than the standard 0.75.