IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a ball python skeleton
(0, 37, D:1)
  a +0 ring mail
(2, 9, D:1)
  a ball python skeleton
(8, 10, D:1)
  a +0 leather armour
(10, 12, D:1)
  a +0 ring mail
(18, -1, D:1)
  a ball python corpse (skeletalised by now)
(30, 13, D:1)
  a bat skeleton
(42, 36, D:1)
  a rat corpse (skeletalised by now)
(44, 33, D:1)
  a frilled lizard skeleton
(44, 40, D:1)
  a quokka skeleton
(46, 15, D:1)
  a +0 club
  a +0 club
(49, 11, D:1)
  a bat corpse (skeletalised by now)
(63, 20, D:1)
  a hobgoblin corpse (skeletalised by now)

Level 2 of the Dungeon
(0, 0, D:2)
  a potion of cancellation
(1, 7, D:2)
  a bat corpse