Your connection to the darkness within deepens, and can carry it for longer without succumbing to your own malice.
Prerequisites: Dark Knight level 5th, Darkside class feature.
Reduce the hit points you sacrifice every turn while in Darkside by your Charisma modifier. This cannot reduce the hit points sacrificed lower than half of your dark knight level.
Normal: A dark knight sacrifices hit points equal to his character level every round.