Guess that Cross Skill!

[Renik]

SE may not give any damage buff to Dark Knight, but if you have maurder at least you can cast blood bath which almost last as long as b4b. I'm still feeling gladiator though, Dark Knight doesn't have much ways of self heal usually.

A combination of bloodbath and blood for blood would be good to get a DMG boost relieving the def penalty, but i would not serve as self healing, all healing would be lost to compensate the loss of def, i expect a drain or combos with drain effect for DRK self healing.

Gladiator could work as well, but i can't imagine a dark knight using flash lol.