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Keywords are:  'necromancer spell bone guardian'

Spell: bone guardian            Mana:  33  Int: 17  Wis: 15  Lvl  9 Necr  (28%)
                                (important)   Requires: wood woad
                                Group: Necromancer Animation

Usage:
cast bone guardian <corpse>

This necromancer spell forms an animated creature using the bones
from a fresh corpse.  Some corpses are more amenable to providing
raw materials than others, and the bodies of undead are particularly
difficult to use.

The bone guardian has no intelligence and is largely uncontrollable,
but it will assist the caster in combat and act as a punching bag.
As a skeletal creature, it is particularly resistant to piercing
attacks, but suffers higher damage to crushing blows.

This spell is part of the necromancer 'Animation' skill tree, which
allows the creation of several different types of animated entities.
Each has different strengths and weaknesses, but due to the nature
of the magic you may only control one at a time.

Animated entities such as this require a small amount of mana to
sustain, and may come apart if you run out of mana.