Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  a +0 robe
(0, 6, D:5)
  7 gold pieces
(16, 17, D:5)
  a Trismegistus Codex

Level 6 of the Dungeon
(0, 0, D:6)
  a +0 leather armour
(13, 4, D:6)
  15 arrows