The Short Bow of Amras (x3) (+12,+15)
+1 intelligence, wisdom, dexterity, speed, shooting speed, shooting power. Provides resistance to lightning, fire, cold. Cannot be harmed by acid, electricity, fire, cold. Slows your metabolism.
Min Level 25, Max Level 80, Generation chance 10, 3.0 lbs

(Angband 3.1.2v2)