The Battle Axe 'Lotharang' (2d8) (+14,+13)
+1 strength, dexterity, attack speed. Slays orcs, trolls. Provides resistance to disenchantment. Cannot be harmed by acid, electricity, fire, cold.
When activated, it heals you a fair amount (1/5 of your wounds, minimum 25 HP), heals cut damage, and cures blindness and confusion. Takes 4 to 6 turns to recharge.
Min Level 30, Max Level 100, Generation chance 7, 17.0 lbs

(Angband 3.1.2v2)