Efficiency

Level 4 of the Dungeon
(0, 0, D:4)
  10 gold pieces

Level 5 of the Dungeon
(0, 0, D:5)
  a scroll of identify
(0, 1, D:5)
  23 stones
(1, -2, D:5)
  a +1 dagger of venom
(20, -15, D:5)
  a +0 leather armour

Level 6 of the Dungeon
(0, 0, D:6)
  6 gold pieces