The Trident of Ulmo (4d8) (+15,+19)
+4 dexterity. Slays animals, dragons. Provides immunity to acid. Provides resistance to acid, nether. Cannot be harmed by acid, electricity, fire, cold. Blessed by the gods. Slows your metabolism. Speeds regeneration. Prevents paralysis. Sustains your life force. Grants the ability to see invisible things.
When aimed, it teleports a target monster away. Takes 50 turns to recharge.
Min Level 30, Max Level 127, Generation chance 1, 7.0 lbs

(Angband 3.1.2v2)