The Dagger 'Narthanc' (+4, 3d4)
It increases resistances: +35% fire. It modifies damage: x3.5 fire brand.
It is vulnerable to damage by disenchantment. When wielded and activated,
it fires a bolt or beam of fire, recharging every 8+d8 turns.
Level 4, Rarity 5, 1.0 lbs, 6000 Gold.

(EyAngband 0.5.2)