Efficiency

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

Level 6 of the Dungeon
(0, 0, D:6)
  Tuzas's Disquisition on Poison and the Compass
    Spells                            Type                      Level      
    Known
     a - Blink                         Translocation                 2         
    no
     b - Mephitic Cloud                Conjuration/Poison/Air        3         
    no
     c - Disjunction                   Translocation                 8         
    no