So I'm trying to decide on a way to make a villain loosely inspired by Arthas from WoW (aiming mostly for a undead anti paladin style character, but with heavy emphasis on ice and cold) who acts as the primary agent of a Dragon-God that holds sway over similar powers. What I'm trying to figure out, is how to give these ice-themed abilities to him before he becomes an undead, while he first encounters the party (they'll be 5th level by the time they encounter him).
I've been toying with making him a Gestalt character, but as the party isn't Gestalt I don't know how that would work out CR wise. Otherwise I was debating making a custom archetype, but before I resort to that I was wondering if anyone had any other ideas. Any suggestions are appreciated! Thanks to everyone in advance!