IndexError

Level 1 of the Dungeon
(1, 0, D:1)
  a rat skeleton
(2, 21, D:1)
  a +0 short sword
(4, -15, D:1)
  a +0 whip
  a kobold skeleton
(6, 3, D:1)
  a +0 buckler
(8, -13, D:1)
  a bat skeleton
(11, -10, D:1)
  a +0 short sword
(18, 2, D:1)
  2 stones

Level 2 of the Dungeon
(0, 0, D:2)
  7 stones
(4, 19, D:2)
  a +0 sling
(6, 6, D:2)
  a ball python corpse (skeletalised by now)
(13, -25, D:2)
  a +0 short sword
(18, -14, D:2)
  a +0 club
  a goblin skeleton
(18, -13, D:2)
  an adder skeleton
(19, -13, D:2)
  a rat skeleton
(20, 10, D:2)
  6 poisoned darts
(21, 10, D:2)
  a +0 club
  a +0 robe
(24, 0, D:2)
  a +0 club
(31, 6, D:2)
  a +0 club
(32, 16, D:2)
  a +0 hand axe

Level 3 of the Dungeon
(4, 0, D:3)
  a hobgoblin corpse
(6, 11, D:3)
  a +0 robe
(9, -4, D:3)
  a bat corpse
(10, 7, D:3)
  a +0 club
  a bat corpse
(19, -1, D:3)
  a +0 dagger
(19, 1, D:3)
  a frilled lizard corpse
(37, 14, D:3)
  an adder corpse (skeletalised by now)