Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 hand axe
(4, 1, D:1)
  a rat corpse
(6, 3, D:1)
  a rat corpse

Level 2 of the Dungeon
(0, 0, D:2)
  a frilled lizard corpse
(2, 3, D:2)
  a +0 club
(5, 10, D:2)
  a +0 club
(13, 11, D:2)
  a giant cockroach corpse