Efficiency

Level 4 of the Dungeon
(0, 0, D:4)
  13 gold pieces
(3, 2, D:4)
  11 stones
(12, 9, D:4)
  18 stones

Level 5 of the Dungeon
(0, 0, D:5)
  a potion of degeneration
(8, 3, D:5)
  a +0 robe
(19, -18, D:5)
  15 gold pieces

Level 6 of the Dungeon
(0, 0, D:6)
  a +0 falchion