The Long Sword 'Ringil' (4d5) (+22,+25)
+10 speed. Slays evil creatures, undead, trolls. *Slays* demons. Branded with frost. Provides resistance to cold, fear, light. Cannot be harmed by acid, electricity, fire, cold. Blessed by the gods. Slows your metabolism. Speeds regeneration. Prevents paralysis. Grants the ability to see invisible things.
When aimed, it creates a frost ball with damage 100. Takes 40 turns to recharge.
Radius 1 light.
Min Level 20, Max Level 127, Generation chance 1, 13.0 lbs

(Angband 3.1.2v2)