Riddle

Level 4 of the Abyss
(0, 0, Abyss:4)
  17 stones
(4, 4, Abyss:4)
  30 gold pieces
(11, -13, Abyss:4)
  a +0 robe
(11, 6, Abyss:4)
  27 gold pieces
(12, -12, Abyss:4)
  a scroll of identify
(13, -11, Abyss:4)
  13 sling bullets
(13, -2, Abyss:4)
  3 large rocks
(14, -10, Abyss:4)
  a scroll of enchant armour