Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  a goblin corpse
(0, 6, D:1)
  9 arrows
(0, 17, D:1)
  25 bolts
(14, -3, D:1)
  a bat corpse
(25, 3, D:1)
  a +0 ring mail

Level 2 of the Dungeon
(0, 0, D:2)
  a goblin corpse