Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  15 stones

Level 2 of the Dungeon
(0, 0, D:2)
  an adder corpse
(9, 2, D:2)
  a +0 club
  a hobgoblin corpse
(11, 3, D:2)
  a rat corpse

Level 3 of the Dungeon
(0, 0, D:3)
  a stone
(2, 3, D:3)
  a stone
(5, 13, D:3)
  a +0 dagger

Level 4 of the Dungeon
(0, 0, D:4)
  a stone
(8, 1, D:4)
  27 sling bullets
(32, 29, D:4)
  a +0 quarterstaff