Efficiency

Level 4 of the Dungeon
(0, 0, D:4)
  an adder corpse

Level 5 of the Dungeon
(0, 0, D:5)
  a giant cockroach corpse
(1, -2, D:5)
  a worm corpse
(1, -1, D:5)
  a giant cockroach corpse
(6, -16, D:5)
  13 sling bullets
(7, -15, D:5)
  16 stones
(14, -14, D:5)
  a +1 dagger of venom

Level 6 of the Dungeon
(10, 0, D:6)
  31 arrows
(30, 11, D:6)
  a +0 quarterstaff

a sewer
(0, 0, Sewer)
  a rat corpse