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Keywords are:  'mage spell crystal coat'

Spell: crystal coat             Mana:  35  Int: 23  Wis: 19  Lvl 16 Mage  (28%)
                                (important)   Requires: shards
                                Group: Mage crystal spellgroup

Usage:
cast crystal coat <object>

The 'crystal coat' spell has two distinct uses: it can grow a protective
coat of crystal on items, or it can be used to create a coat of scales
to protect a creature.

When used on an item, it causes a thin film of crystal to grow.  The
crystal adds weight, but also has the side effect of making the item
almost impervious to rust and  elemental forms of damage.  Crystal
coat can be used to prevent items from being used in brews.

When cast on a character, the scales provide a substantial amount of
protection from physical attacks, absorbing the force of blows by
shattering while also providing resistance to various elements.
Due to its high cost and short duration, this spell is usually cast
on the warriors and fighters of large groups, just before battle.