Efficiency

Level 6 of the Dungeon
(0, 0, D:6)
  7 gold pieces
(7, 4, D:6)
  9 arrows

Level 7 of the Dungeon
(0, 0, D:7)
  a wand of flame (14)
(0, 1, D:7)
  25 gold pieces
(0, 2, D:7)
  9 poisoned darts
(1, 0, D:7)
  a potion of resistance
(1, 1, D:7)
  7 gold pieces
(1, 2, D:7)
  a scroll of remove curse
(3, 0, D:7)
  a +0 trident
(5, -6, D:7)
  7 gold pieces