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Keywords are:  'mage spell shardstorm storm'

Spell: shard storm              Mana:  18  Int: 31  Wis: 27  Lvl 28 Mage  (21%)
                                (important)   Requires: crystal spear
                                Group: Mage crystal spellgroup
                                Damage Type: slash
                                Damage: high area  
                                Speed: average
                                (Can Be Channeled)

Usage:
cast shardstorm <target>

This high level mage spell creates thousands of tiny crystal shards that
whirl around the caster, slashing anything that is within their range of
influence.  This spell is very powerful against swarms of weakly armored
enemies, or especially large lightly armored creatures.

Heavy armor will help protect against this spell.