Berserk

SKILL
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Only powerful warriors can master berserking, the ability to enter 
insane rage in combat.  Its effects are not altogether unlike the frenzy 
spell -- a huge surge of combat prowess, coupled with a disregard for 
personal safety.  Berserking warriors are more resistant to the effects 
of magic.
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Classes and levels for berserk:
warrior     : 27  ranger      : 50  zealot      : 50  
knight      : 12  guardian    : 30  morpheous   : 19  
paladin     : 30  dreadlord   : 30