The Long Sword 'Anguirel' (2d5) (+10,+12)
+2 strength, constitution, speed, attack speed. Slays evil creatures, demons. Branded with venom. Provides resistance to lightning, light, dark. Cannot be harmed by acid, electricity, fire, cold. Prevents paralysis. Grants the ability to see invisible things. Aggravates creatures nearby.
Radius 1 light.
Min Level 20, Max Level 127, Generation chance 3, 13.0 lbs

(Angband 3.1.2v2)