Either under the Possession entry or in the intro text to the template (or both). What do you think? Dealing half the mezzikim's hp damage and certain spells? Opinions on spells?
Under the possession entry, definitely. Dispel law, dispel evil and dismissal/banishment all seem appropriate. I could see an argument for remove curse/break enchantment, too.
I notice the original text gives 'em minor spell resistance (5%). Shall we give them spell resistance equal to CR+1, or SR 12 by following the conversion book guidelines faithfully?