House of the Magus
Iterative attacks work differently. Replace the regular 3.5 progression with the following:
With a BAB of 6, you get a 2nd attack, but both attacks suffer a -2 penalty (-2/-2 instead of 0/-5).
With a BAB of 11, the penalty drops to -1/-1 (instead of 0/-5/-10).
With a BAB of 16, the penalty drops to -0/-0 (instead of 0/-5/-10/-20).