LoL, just realised that the fact that my character's heart isn't beating doesn't really make sense, since he's a skeleton...

Responding to your point on the Interest Check, I was thinking that either:
-I could restrict which powers he could use
OR
-I could only allow him to do it in small areas 
OR
-He can only do it infrequently, as it drains him of too much energy.

Whichever one you prefer. I will repost the CS once I've got it finalised.