[Taqwus]

Incidentally, regarding insanity, it is possible to drive an enemy pretender seriously insane through the use of Void Spirits. A Jomon Master Lich had an insanity score over 70 through prolonged stay of a single Void Spirit in the Jomon capital.

I don't know whether it was permanent over rebirth ala Curse, 'tho, as his nation completely collapsed shortly after I killed him once, in my dominion.