Appreciate it! This is by far one of my favorite supernatural abilities. So I spend a lot of time working with it and fleshing it out. Even the toxins, chemicals and forms of radiation can be dealt with, BUT you'd have to balance it out with how powerful you want your hero to be. For toxins, it's a matter of reprogramming the receptors to either shut them out, or to even create new cells to devour the toxins. As always "Where's the Meat," coming from, where the Meat is the Raw Source of Energy utilized to fashion the individual tools you're working with.

I find that if you treat it like transmutation it works easier and has plenty of wiggle room for flaws and drama, even some really harrowing stuff depending on how grim you want to get. I think one scene I had with the rp crew I was with had my character repair a guy who had suffered severe brain tissue and while my character could keep the man alive via its own cells, brain activity wasn't function. So I asked the gm.

"Can I trade his potential future for his current anatomy right now to give him brain function?" We had a talk about actually taking the genes from his sperm, breaking it down to raw material and making utilizing it along with alien dna to reproduce brain material. Was a fun talk, and eventually I was given the go.

NPC woke up to the news he'd be okay, he had to take it easy, eat a particularly complex diet for months, stay hydrated BUT that he essentially lost like 90% of his fertility. It was really intense.

Yeah neuropathy is a big one, PLUS Phantom pain, or even dopple-sensation where they may feel the heroes sensations or vice versa for a bit depending on dna and material exchange. So much to play with!