Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  a book of Rime
(2, 6, D:1)
  a rat corpse
(2, 10, D:1)
  8 gold pieces
(15, -6, D:1)
  a +0 ring mail
(30, -1, D:1)
  a +0 mace
(31, -3, D:1)
  16 arrows

Level 2 of the Dungeon
(0, 0, D:2)
  a hobgoblin corpse

Level 3 of the Dungeon
(0, 1, D:3)
  a book of Death