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Keywords are:  'necromancer spell soulshatter shatter'

Spell: soulshatter              Mana:  25  Int: 26  Wis: 24  Lvl 24 Necr  (28%)
                                (obscure)   Requires: soulforge
                                Group: Necromancer Soulbind

The 'soulshatter' spell is used to split high level soulstones
into smaller pieces.  A single high level soulstone may shatter into
a dozen or more shards of varying levels.