The Spear 'Nimloth' (1d6) (+11,+13)
+3 stealth, speed. Slays undead. Branded with frost. Provides resistance to cold. Cannot be harmed by acid, electricity, fire, cold. Blessed by the gods. Grants the ability to see invisible things.
Min Level 15, Max Level 65, Generation chance 8, 5.0 lbs

(Angband 3.1.2v2)