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A raid is an attack by one clan on another.  Most of the time it is
initiated in order to enter the defending clans HQ and purchase their
armor. Sometimes it is done to boost the attacking clan's PKs, and
then every once in a while it is done out of sheer boredom.  Of course
there are rivalries between certain clans, and sometimes this is the
cause of a raid.  For the rules on raiding, see help raiding.