Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  21 stones
(7, -8, D:5)
  a +0 shortbow
(10, -14, D:5)
  18 stones

Level 6 of the Dungeon
(0, 0, D:6)
  15 arrows
(4, -8, D:6)
  a +0 club
(11, 0, D:6)
  a +0 short sword
(13, -4, D:6)
  a +0 spear
(14, -2, D:6)
  a scroll of immolation