Base Attack Bonus
From DDO Compendium
Base attack bonus, commonly referred to as BAB, is a characters base modifier to a roll to hit an opponent with a melee attack.
A characters BAB progression is based on their class or classes. Fighters, Paladins, Rangers, and Barbarians receive Tier 1 BAB progression; Bards, Clerics, and Rogues Tier 2; Sorcerers and Wizards Tier 3. The various progressions are as follows:
| Level | Tier 1 | Tier 2 | Tier 3 |
| 1 | 1 | 0 | 0 |
| 2 | 2 | 1 | 1 |
| 3 | 3 | 2 | 1 |
| 4 | 4 | 3 | 2 |
| 5 | 5 | 3 | 2 |
| 6 | 6/1 | 4 | 3 |
| 7 | 7/2 | 5 | 3 |
| 8 | 8/3 | 6/1 | 4 |
| 9 | 9/4 | 6/1 | 4 |
| 10 | 10/5 | 7/2 | 5 |
| 11 | 11/6/1 | 8/3 | 5 |
| 12 | 12/7/2 | 9/4 | 6/1 |
| 13 | 13/8/3 | 9/4 | 6/1 |
| 14 | 14/9/4 | 10/5 | 7/2 |
| 15 | 15/10/5 | 11/6/1 | 7/2 |
| 16 | 16/11/6/1 | 12/7/2 | 8/3 |
