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Vorpal Plating

       Usage: cast 'vorpal plating' <target> : cast 67 <target>
      Effect: AC -30
        Cost: 20
    Duration: 12 hours
Casting Time: 12
      Target: One MOB or character

The classes that get the spell vorpal plating are:

magic-user : Level   6 (good)
bard       : Level  26 (good)
darknight  : Level  31 (fair)
wizard     : Level   4 (excellent)
druid      : Level  70 (excellent)
illusionist: Level   7 (excellent)
necromancer: Level  18 (excellent)