Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  4 poisoned darts

Level 6 of the Dungeon
(0, 0, D:6)
  8 gold pieces
(2, -1, D:6)
  21 gold pieces (still there?)
  a +0 battleaxe (still there?)

Level 7 of the Dungeon
[Shop] Qajef's Distillery
  (Shop contents are unknown)
(0, 0, D:7)
  a potion of degeneration
(1, -6, D:7)
  a +0 hand axe