Find the hidden ability game!

I can't seem to find Mal'Ganis' Dark Conversion ability anywhere in the Object Editor. Is it hidden from the WE? Is it just hiding somewhere in a cranny?

I'll post a picture of a pair of pants for the first person with a correct answer.

Neutral Hostile -> Heroes

Hehe, I love the picture award idea.

Thanks, combatken. Heaven forbid that the campaign undead hero's ability would be under Undead.
As promised, here's pants.