Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  a +0 giant club

Level 6 of the Dungeon
(0, 0, D:6)
  a book of Necromancy
(8, -7, D:6)
  a scroll of identify
(32, -12, D:6)
  10 gold pieces
(34, -15, D:6)
  21 stones
(37, -9, D:6)
  16 arrows

Level 7 of the Dungeon
(0, 0, D:7)
  25 stones
(3, 2, D:7)
  a book of Weapons