IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 spear
(12, 11, D:1)
  a +0 mace
(12, 12, D:1)
  a ball python corpse
(12, 14, D:1)
  a +0 hand axe
(17, 23, D:1)
  a +0 dagger
  a goblin corpse