The Scimitar 'Haradekket' (4d2) (+9,+11)
+2 dexterity, attack speed. Slays animals, evil creatures, undead. Cannot be harmed by acid, electricity, fire, cold. Grants the ability to see invisible things.
Min Level 20, Max Level 80, Generation chance 7, 13.0 lbs

(Angband 3.1.2v2)