Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  a +0 plate armour

Level 6 of the Dungeon
(2, 8, D:6)
  a +0 club (still there?)
  15 arrows (still there?)
  an orc corpse (still there?)
(5, -2, D:6)
  a +4 ring of protection