The halberd is one part of your problem (it's incredible how few people can imagine *cursed* items <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" /> ) but unfortunately the other half looks like a bug.

Wait for someone with more knowledge than me.

When you find a big kettle of crazy, it's best not to stir it.
--Dilbert cartoon

"Interplay.some zombiefied unlife thing going on there" - skavenhorde at RPGWatch