The Mattock of Nain (3d8) (+12,+18)
+6 to STR, Searching, Infravision, Tunneling
Slay Orc, Troll, Giant, Dragon
Acid Brand
Resist Acid, Dark, Disenchantment
Activates for stone to mud every 2 turns
Level 60, Rarity 5, 25.0 lbs, 80000 Gold

(Hengband 1.6.0)