The Cloak 'Colluin' [1,+15]
Provides resistance to acid, lightning, fire, cold, poison. Cannot be harmed by acid, electricity, fire, cold.
When activated, it grants temporary resistance to acid, electricity, fire, cold and poison for 1d20+20 turns. Takes 111 turns to recharge.
Min Level 5, Max Level 100, Generation chance 2, 1.0 lbs

(Angband 3.1.2v2)