The Augmented Chain Mail of Caspanion (-2) [16,+20]
+3 intelligence, wisdom, constitution. Provides resistance to acid, poison, confusion. Cannot be harmed by acid, electricity, fire, cold.
When activated, it destroys all traps and doors surrounding you. Takes 10 turns to recharge.
Min Level 25, Max Level 100, Generation chance 11, 27.0 lbs

(Angband 3.1.2v2)