Efficiency

Level 4 of the Dungeon
(0, 0, D:4)
  a +0 war axe

Level 5 of the Dungeon

Level 6 of the Dungeon
(0, 0, D:6)
  12 gold pieces
(1, 3, D:6)
  a potion of brilliance
(6, -7, D:6)
  13 gold pieces
(6, -1, D:6)
  20 stones