The Phial of Galadriel
Cannot be harmed by acid, electricity, fire, cold.
When activated, it lights up the surrounding area, hurting light-sensitive creatures. Takes 11 to 20 turns to recharge.
Radius 3 light.
Min Level 5, Max Level 100, Generation chance 40, 1.0 lbs

(Angband 3.1.2v2)