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Keywords are:  'mage spell crystal prison'

Spell: crystal prison           Mana:  60  Int: 35  Wis: 31  Lvl 33 Mage  (28%)
                                (helpful)   Requires: shard storm
                                Group: Mage crystal spellgroup
                                
                                Speed: slow

Usage:
cast crystal prison <target>

With this spell, powerful mages can encase an opponent in crystal,
immobilizing them completely.  It takes time for the crystal to form and
surround the target, so a sufficiently dextrous or strong target may be
able to escape or shatter the prison before it is completed.

This spell cannot take hold on living creatures, as the spell matrix,
like that of crystal coat, only binds to inanimate matter. It is
therefore useful for disabling undead and constructs like golems.