...I'll be honest, gave it a read and I'm not a fan of the 'absorbing monsters power for your own thing'

Reminds me a bit too much of Aldrich, if I'm reading that right, and I think he was probably a special case. And while that's not necessarily a bad thing...it just seems to well, break away too much from established Dark Souls lore and things. Seems like he'd...I dunno, be something that'd be more of a boss or NPC type thing.

I dunno, I'm not sure why at the moment, but it just doesn't sit well with me. 

Seems like it could easily just become quite overpowered, I think, compared to the rest of the characters.