The Dagger of Fiona (2d4) (+6,+9)
+2 to DEX, Attacks, Speed
Frost Brand; Poisoned
Resist Cold
Throwing; See Invisible; Slow Digestion; Regeneration
Activates for frost ball (48) every 5+d5 turns
Level 10, Rarity 40, 1.2 lbs, 50000 Gold

(Hengband 1.6.0)