Varlak wrote...
Also how can I know the formula for my bab and ab ? When you go pure its easy you just look at the chart but when your mixing class every level or so I don,t know how to get it
In most cases, just add the BAB from each class.
So if you have Monk 4 / Cleric 4, look at the charts:
4th level Monk has +3
4th level Cleric has +3
So your Monk 4 / Cleric 4 has +6.
This is where you can note the difference of grouping as well. If your level 2 character is Monk 1 / Cleric 1, then your character has +0 BAB. If your level 2 character is Monk 2 (or Cleric 2), you have +1 BAB.
Monk or Cleric levels 1, 5, 9, 13, and 17 have no BAB gain. To maximize your BAB early, put off taking one of those levels with no BAB gain until you have no choice but to take one. After your first four levels of Monk, for example, your next choice is either Monk 5 or Cleric 1- both come with no BAB gain. That's why you want to group the levels in 4s in terms of advancement, if possible. It is not always possible depending on other considerations, such as advancement in class-specific skills or choosing class-specific feats at the right character level.
It gets trickier when you are figuring out where your extra attacks come, and you have a Monk.
For every situation but an unarmed Monk, your extra attacks come at +6 BAB (for +6/+1 attacks), +11 BAB (for +11/+6/+1 attacks), and +16 BAB (for +16/+11/+6/+1).
If you have any Monk levels and are fighting unarmed or with kamas, you add up your total BAB based on all classes, but look at the Monk unarmed chart to figure out extra attacks come at what BAB. Your extra attacks actually come based on total BAB and not class level.
At level 21+, you get +1 BAB regardless of class, while your extra attacks never advance beyond what they were based on your level 20 BAB. So after level 20, you don't need to group classes in 4s anymore for BAB purposes.