IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a ring of see invisible {sInv, !d}
(17, 10, D:1)
  a +2 dagger of venom
  a goblin skeleton
(18, -9, D:1)
  a rat skeleton
(18, 10, D:1)
  a ball python skeleton
(18, 13, D:1)
  a +0 dagger
  a goblin skeleton
(29, 20, D:1)
  a +0 dagger
  a kobold skeleton
(31, 16, D:1)
  a +0 short sword
(32, 14, D:1)
  a hobgoblin skeleton
(35, -5, D:1)
  a hobgoblin skeleton
(35, -4, D:1)
  a quokka skeleton
(36, -4, D:1)
  a +0 club
(36, 13, D:1)
  a bat skeleton
(37, 41, D:1)
  a hobgoblin corpse (skeletalised by now)
(48, -1, D:1)
  a ring of fire
(49, 16, D:1)
  a ball python corpse (skeletalised by now)
(53, 20, D:1)
  a +0 club
(53, 29, D:1)
  a ball python corpse (skeletalised by now)
(57, 17, D:1)
  a bat skeleton
(58, 17, D:1)
  a +0 dagger
  5 stones
  a kobold corpse (skeletalised by now)
(58, 31, D:1)
  a +0 club
(65, -2, D:1)
  a quokka corpse (skeletalised by now)

Level 2 of the Dungeon
(0, 0, D:2)
  a +0 dagger
  a goblin corpse (skeletalised by now)
(6, -17, D:2)
  a +0 club
  a goblin skeleton
(6, 24, D:2)
  a +0 short sword
(7, 15, D:2)
  8 stones
(11, -10, D:2)
  a +0 ring mail
(12, 22, D:2)
  6 stones
(16, 18, D:2)
  a ring of resist corrosion
(17, 14, D:2)
  a ball python skeleton
(19, 9, D:2)
  a ring of poison resistance
(26, 9, D:2)
  a hobgoblin skeleton
(27, -9, D:2)
  a +0 leather armour
(35, 29, D:2)
  a +0 short sword
(37, -2, D:2)
  3 stones

Level 3 of the Dungeon
(10, -14, D:3)
  a +0 whip
(10, -13, D:3)
  17 gold pieces
(10, -12, D:3)
  9 gold pieces
(16, 5, D:3)
  a +0 dagger
(17, -33, D:3)
  5 stones
(18, -4, D:3)
  a +0 chain mail
(18, 10, D:3)
  a +0 dagger
  a +0 hand axe
  an orc skeleton
(19, -17, D:3)
  a potion of curing
(19, 9, D:3)
  a +0 trident
(19, 10, D:3)
  a +0 hand axe
  an orc skeleton
(24, -24, D:3)
  2 stones
  a +0 dagger
(31, 3, D:3)
  a rat skeleton
(33, 4, D:3)
  a ball python skeleton
(36, -32, D:3)
  4 stones
(41, -5, D:3)
  a +0 club
  a goblin skeleton

Level 4 of the Dungeon
(0, 0, D:4)
  a +0 flail
  a gnoll corpse