Efficiency

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 short sword

Level 2 of the Dungeon
(0, 0, D:2)
  a rat corpse (skeletalised by now)

Level 3 of the Dungeon
(0, 0, D:3)
  11 gold pieces
(9, -3, D:3)
  a bat corpse
(21, 0, D:3)
  a +0 club
(25, 14, D:3)
  20 stones
(46, -9, D:3)
  a dart slug corpse
(48, -8, D:3)
  a rat corpse

Level 4 of the Dungeon
(0, 0, D:4)
  a +0 leather armour
(2, 3, D:4)
  a book of Displacement

Level 5 of the Dungeon
(0, 0, D:5)
  10 gold pieces