Since I haven't drawn something simple for myself for a while, have some undead concepts of Wim and Tristan. Maybe canon, maybe not.

The way Tristan's powers work right now would mean that he could keep on going after dying without problems. He wouldn't even rot, since he is able to kill microorganisms around him (which is a reason why doesn't get sick often), he would just dry out if he didn't care for his body. 

Wim would not be into this, obviously. (He is still immune to magic, but there are ways for Tristan to keep him in the state of undeath.

(Wim is the big guy, Tristan is the small nerd.)