Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  a +0 robe

Level 6 of the Dungeon
(0, 0, D:6)
  a potion of degeneration
(0, 3, D:6)
  a +0 falchion
(8, 14, D:6)
  a potion of magic
(29, 24, D:6)
  a +0 robe
(34, 25, D:6)
  a +0 dagger
(35, 26, D:6)
  a water moccasin corpse
(35, 27, D:6)
  a +0 whip
(35, 28, D:6)
  a +0 mace

Level 7 of the Dungeon
(0, 0, D:7)
  2 potions of flight