Willpower does not work on darkhawk

I have 1 point in willpower mastery. I fought using my 5* darkhawk and I had about 50% health.
I had a fatigue debuff on me but no regeneration.

Comments

Well, yeh. He is a robot

Willpower does'n't affect robots

Darkhawk is a cyborg (think RoboCop) and willpower don't effect robots. It's simple.

Thank you for answering this one, folks. I'm closing it down as we got an answer.