Originally Posted by qhristoff
The Bhaal Heritage never specifically held you back or required you to do something about it in order to unlock your ability to play the game.

Nor does the source, and possibly larva.

Source was occasionally required but overall I used it as much as I did Bhaal's powers (so not much).

And it seems that larva, like Slayer form in BG2, grants power at a cost of... something.