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Poison

       Usage: cast 'poison' <target> : cast 33 <target>
      Effect: Poisons target, -((level/7)+1) to STR 
        Save: Save vs. Poison
        Cost: 16
    Duration: level/2 hours
Casting Time: 12
      Target: One MOB or character

The classes that get the spell poison are:

magic-user : Level  45 (average)
cleric     : Level  28 (good)
priest     : Level  18 (excellent)
bard       : Level  65 (average)
darknight  : Level  71 (fair)
wizard     : Level  30 (good)
druid      : Level  20 (excellent)
ranger     : Level  32 (excellent)
necromancer: Level  10 (Superb)