Efficiency

Level 4 of the Dungeon
(0, 0, D:4)
  a hound corpse
(5, 8, D:4)
  a frilled lizard skeleton
(6, 11, D:4)
  a rat skeleton
(14, -3, D:4)
  18 gold pieces
(15, -2, D:4)
  23 stones

Level 5 of the Dungeon
(0, 0, D:5)
  a +0 robe
(0, 4, D:5)
  7 gold pieces

Level 6 of the Dungeon
(0, 0, D:6)
  a scroll of enchant weapon