The damage is too low for my late-game warrior to get much use out of this now, but otherwise wow:
Code:
the Short Sword of Fearad (1d7) (+6,+16) <+4>
Found lying on the floor in a vault at 3800 feet (level 76).
+4 dexterity.
Slays giants, dragons.
Provides immunity to lightning, cold.
Provides resistance to disenchantment.
Provides protection from fear.
Cannot be harmed by acid, electricity, fire, cold.
Grants telepathy.