Efficiency

Level 4 of the Dungeon
(0, 0, D:4)
  a +0 robe
(2, 2, D:4)
  17 bolts
(4, -7, D:4)
  22 stones

Level 5 of the Dungeon
(0, 0, D:5)
  9 gold pieces

Level 6 of the Dungeon
(0, 0, D:6)
  a book of Dangerous Friends
(24, -12, D:6)
  a +0 dagger
(29, -10, D:6)
  a +0 flail

Level 7 of the Dungeon
(0, 0, D:7)
  20 stones