How do you remove Attila's trait that prevents him from being killed?

[Fromage99]

I've wounded him 8 times, in battle, auto-resolve, or agents. I just want Attila to die when he is killed. Maybe its a glitch in v1.1? Before he died pretty easy. Now its ridiculous.

I couldn't find anything in the character traits section.

[M3GA.Ridonk]

campaigns->main_attila->factions->att_attila_story.lua

Seems to make him vulnerable at seal 4. Have you met the conditions in that playthrough? I don't see any issues that would cause it not to fire. If it is a bug then you could just force attila to become human when he comes of age (There's an if player=human check then that makes him vulnerable, simple enough to just remove the if part so that he always becomes vulnerable).