IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a potion of curing
(0, 1, D:1)
  a +0 sling
(5, 5, D:1)
  a hobgoblin corpse
(6, 6, D:1)
  a ball python corpse
(8, 8, D:1)
  a scroll of fog
(13, 7, D:1)
  a kobold corpse
(25, 19, D:1)
  a stone