Mystic Shield

MYSTIC SHIELD 

       Usage: cast 'mystic shield' : cast 71
      Effect: AC -40
        Cost: 40
    Duration: 24 hours
Casting Time: 12
      Target: Caster only

The classes that get the spell mystic shield are:

magic-user : Level  85 (good)
cleric     : Level  80 (fair)
priest     : Level  73 (excellent)
darknight  : Level 105 (average)
wizard     : Level  70 (good)
illusionist: Level  70 (good)
paladin    : Level 100 (awful)