Efficiency

Level 3 of the Dungeon
(0, 0, D:3)
  13 bolts

Level 4 of the Dungeon
(0, 0, D:4)
  a +0 ring mail
(4, 2, D:4)
  17 gold pieces
(4, 12, D:4)
  15 arrows
  a +0 shortbow
  a centaur corpse
(16, 13, D:4)
  13 gold pieces

Level 5 of the Dungeon
(0, 0, D:5)
  18 stones

the Ecumenical Temple