[quote=@Hellis]
If you just make him dumb as a rock, that is fine. Its a trope, and imo not to offensive. If its the result of evildoing, it further removes it from those kind of problems from what I can tell with peoples reactions. I'll allow it. I will reserve final judgement until after I gotten the the full CS, naturally.[/quote]

It'll probably be a bit more profound than just "dumb as a rock", but I'll try to portray a generalised mental disability as accurately as I can. Character sheet coming up.