IndexError

Level 1 of the Dungeon
[Shop] Reneh's Book Boutique
  a book of the Hunter (260 gold)
  a manual of Staves (800 gold)
  a book of Storms (260 gold)
  a book of Chaos (500 gold)
  the Grimoire of the Volley (420 gold)
    Spells                            Type                      Level
     a - Fulminant Prism               Conjuration/Alchemy           4
     b - Arcjolt                       Conjuration/Air               5
     c - Chain Lightning               Conjuration/Air               9
  a book of Burglary (220 gold)
  a Trismegistus Codex (280 gold)
  a book of Party Tricks (220 gold)
(0, 0, D:1)
  a +0 leather armour
(10, 5, D:1)
  a +0 robe
(12, 4, D:1)
  a ball python corpse (skeletalised by now)
(29, -10, D:1)
  a +0 leather armour
(31, -9, D:1)
  a +0 robe
(39, -3, D:1)
  a book of Blasting
(44, 14, D:1)
  a bat corpse (skeletalised by now)
(45, -20, D:1)
  a +0 leather armour
(46, -11, D:1)
  a stone
  a kobold skeleton
(48, -10, D:1)
  a goblin skeleton
(48, 28, D:1)
  a quokka corpse (skeletalised by now)
(52, -20, D:1)
  a +0 dagger
  a +0 club
  a +0 short sword
  a +0 short sword
(52, -19, D:1)
  a hobgoblin corpse (skeletalised by now)

Level 2 of the Dungeon
(0, 0, D:2)
  a rat corpse (skeletalised by now)
(2, -17, D:2)
  a frilled lizard corpse (skeletalised by now)
(2, 12, D:2)
  a +0 robe
(10, 7, D:2)
  an adder corpse (skeletalised by now)
(11, -12, D:2)
  an adder corpse (skeletalised by now)
(14, -17, D:2)
  a ball python skeleton
(14, -3, D:2)
  a +0 club
  a goblin corpse (skeletalised by now)
(14, 6, D:2)
  a hobgoblin corpse (skeletalised by now)
(15, -30, D:2)
  an adder skeleton
(20, 6, D:2)
  a ball python skeleton
(22, 1, D:2)
  a ball python skeleton
(33, -2, D:2)
  a ball python skeleton
(40, 3, D:2)
  a +0 dagger
  4 stones
(41, -23, D:2)
  a ball python skeleton
(42, -24, D:2)
  a rat skeleton
(46, -16, D:2)
  a ball python skeleton

Level 3 of the Dungeon
(0, 0, D:3)
  a rat corpse
(4, -7, D:3)
  a +0 dagger
  a goblin corpse
(4, 0, D:3)
  7 gold pieces
(4, 4, D:3)
  a book of Spatial Translocations
  5 gold pieces
(5, 0, D:3)
  2 gold pieces
(5, 1, D:3)
  8 gold pieces
  13 gold pieces
(6, 2, D:3)
  12 gold pieces
(7, 1, D:3)
  a ring of magical power
(8, -3, D:3)
  a +0 club
(31, -10, D:3)
  a potion of might
(32, -10, D:3)
  a +0 ring mail