Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  19 gold pieces
(6, 3, D:5)
  9 gold pieces

Level 6 of the Dungeon
(0, 0, D:6)
  a +0 ring mail

Level 7 of the Dungeon
(0, 0, D:7)
  a scroll of noise