Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  a +0 trident
(3, 19, D:5)
  9 gold pieces
(16, 5, D:5)
  a book of Minor Magic
(17, 10, D:5)
  8 gold pieces
(17, 13, D:5)
  a +0 robe
(22, 3, D:5)
  4 large rocks
(23, 9, D:5)
  an orb of energy
(30, 7, D:5)
  19 gold pieces

Level 6 of the Dungeon
(0, 0, D:6)
  16 gold pieces
(8, -29, D:6)
  a potion of curing
(8, -28, D:6)
  5 gold pieces

Level 7 of the Dungeon
(0, 0, D:7)
  a scroll of immolation
(4, 10, D:7)
  13 gold pieces