The Mattock of Nain (+12,+18)
This is a digging tool. Use it to dig in walls, destroy doors, or cut wood.
Wielded by Nain of the Iron Hills at the Battle of Azanulbizar, this great
mattock brought victory to the Dwarves over Azog's Orcs - though Nain
himself fell at the last, even with victory already assured.
It can be activated for stone to mud every 5 turns if it is being
worn. It increases your strength, searching, infravision and ability
to tunnel by 6. It does extra damage from acid. It is especially
deadly against dragons. It is especially deadly against orcs. It is
especially deadly against trolls. It is especially deadly against
giants. It provides resistance to acid, dark and disenchantment. It
allows you to climb mountains. It allows you to sense the presence of
orcs. It cannot be harmed by acid, cold, lightning or fire.
Level 60, Rarity 5, 25.0 lbs, 30000 Gold

(T.o.M.E. 2.3.5)