Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  15 gold pieces

Level 6 of the Dungeon
(0, 0, D:6)
  an amulet of magic regeneration
(2, 6, D:6)
  a +0 hunting sling
(4, -2, D:6)
  a book of Armaments