The Broad Axe 'Barukkheled' (2d6) (+13,+19)
+3 constitution. Slays evil creatures, orcs, trolls, giants. Cannot be harmed by acid, electricity, fire, cold. Grants the ability to see invisible things.
Min Level 20, Max Level 75, Generation chance 12, 16.0 lbs

(Angband 3.1.2v2)