Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  9 gold pieces

Level 6 of the Dungeon
(0, 0, D:6)
  6 stones
(6, -6, D:6)
  21 stones
(8, 0, D:6)
  a +0 leather armour

Level 7 of the Dungeon

the Ecumenical Temple