Efficiency

Level 5 of the Dungeon
[Shop] Walaex's Antique Weapon Shop
  (Shop contents are unknown)
(0, 0, D:5)
  a scroll of torment
(5, -9, D:5)
  22 stones
(7, -1, D:5)
  an adder corpse
(13, -10, D:5)
  a +0 robe
(19, 5, D:5)
  a book of the Spheres
(21, 10, D:5)
  a scroll of blinking
(24, 16, D:5)
  5 arrows
(26, 16, D:5)
  a scroll of fear
(35, 11, D:5)
  10 gold pieces

Level 6 of the Dungeon
(0, 0, D:6)
  6 gold pieces
(1, -11, D:6)
  a +6 ring of intelligence

Level 7 of the Dungeon
(0, 0, D:7)
  9 sling bullets