The Augmented Chain Mail of Caspanion (-2) [16,+20]
It increases your intelligence, wisdom, and constitution by 3. It provides resistance to acid, poison, and confusion. It activates for door and trap destruction every 10 turns. It cannot be harmed by the elements.
Level 25, Rarity 9, 27.0 lbs, 40000 AU

(NPPangband 0.5.0-WIP8a)