I read Bloodborn and thought it would be a perfect match for Corruptor.
6 levels in, I put a skill point in Blood Mage, and it reduced my max Vim from 220 to 40, which is a slight problem.
This talent can alter the world in a permanent way, as such you can never relearn it once known.
Edit: I see that Blood Magic skill is borrowed from Nullpack and designed for a different class. So maybe this can be considered working as intended. Blood Mage on Corruptor would be very strong if it didn't destroy the Vim pool, but makes sustains a huge problem when it does.