The Bastard Sword 'Calris' (5d4) (-20,+20)
Heavily cursed. +5 constitution. Slays evil creatures, demons, trolls. *Slays* dragons. Provides resistance to disenchantment. Cannot be harmed by acid, electricity, fire, cold. Aggravates creatures nearby.
Min Level 30, Max Level 127, Generation chance 7, 14.0 lbs

(Angband 3.1.2v2)