Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  a book of Displacement

Level 6 of the Dungeon
[Shop] Sinenicu's Antique Weapon Boutique
  (Shop contents are unknown)
(0, 0, D:6)
  28 arrows
(8, 5, D:6)
  2 throwing nets
(17, 19, D:6)
  a scroll of identify
(18, 17, D:6)
  a +0 ring mail
(20, 8, D:6)
  18 stones