The Amulet of Carlammas
+2 to constitution. It increases resistances: +25% acid. It cannot be
damaged by any means. When worn and activated, it provides temporary
protection from lesser evil creatures, recharging every 225+d225 turns.
Level 50, Rarity 10, 0.3 lbs, 30000 Gold.

(EyAngband 0.5.2)