Soul Driver before and after Chaos.

Except Vampire still sucks. If you're a NL, you heal more from drain. If you're a Shadower, Chakra does a better job of healing. So pretty much, the only class that'll get much out of Vampire is the DB, but that said, Vampire is hardly reliable healing at all as it only recovers 5% of the damage per hit at max level.

Then what does it mean when I barely use HP pots when training. Vampire on a shadower is a godsend. Also. Yes, Chakra sucks.