I've tried following: I took the resources of the skeleton and simply put them into the viziers folder (overwriting the existing files with the same name)
So nearly every frame is now a skeleton, except the ones for "death" (I left them just the way they are for a short test run)
So I generated a killable Skeleton, I thought.

I put the resources back in the game and started level 12b Jaffar now was a skelleton with hit points and everything worked fine.
BUT if I killed the skelleton (jaffar) the game completely collapses.

Does anybody know what the problem is?