The Amulet of Carlammas
+4 constitution. Provides resistance to fire. Cannot be harmed by acid, electricity, fire, cold.
When activated, it grants you protection from evil for 1d25 plus 3 times y our character level turns. Takes 226 to 450 turns to recharge.
Min Level 50, Max Level 100, Generation chance 10, 0.3 lbs

(Angband 3.1.2v2)