FIX: demonic mistress should be female
FIX: tome of brightest flame

It didn't disappear after reading, making you effectively immortal.
Vial of purification rewrite

* Automatically deactivate all undead forms
* Different behaviour for Chton worshippers
Re-add ODing

Why did I ever comment this out? Taking more than one package of ment at
the same time gives you a chance at ODing. This has no influence on
gameplay, but seems thematically appropriate.