Amulet of unchanging

This amulet grants the intrinsic Unchanging, which protects against both polymorph effects (including and petrifaction. It will prevent inconvenient transformations from divine punishment, Chameleon corpses, a Ring of Polymorph, or a Wand of Polymorph. Similarly, the wearer need not fear the power of a Cockatrice, as the deadly tranformation will fail at the last minute.