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Keywords are:  'necromancer spell crystal skull'

Spell: crystal skull            Mana:  52  Int: 36  Wis: 34  Lvl 39 Necr  (28%)
                                (helpful)   Requires: metal construct
                                Group: Necromancer Animation
                                (Can Be Bloodcast)

Usage:
cast crystal skull <crystal>'

This necromancer spell allows the caster to create a skull-shaped
construct from an un-worked, un-hewn piece of crystal, rock or natural
glass such as those recovered by mining. The floating construct
follows the caster, and can defend itself with magic beam attacks.

Crystal skulls are most useful against enemy spellcasters,
particularly ones that cast elemental magic spells. The skull can
absorb incoming magical, fire, ice and lightning attacks. While it
generates no mana of its own, it can take the mana it gains from
absorbing spells cast upon it to heal undead and skeletal creatures
that follow its master.

You need not have any knowledge of mining or lapidary to create
a crystal skull. Raw materials can be found for sale in many
alchemy shops.

Crystal skulls retain the luster and color of the mineral they
are made from, thus many different variants are seen, such as
amethyst skulls or obsidian skulls. Lapidary materials that grant
resistances or absorption to a particular element as their primary
trait yield skulls that are better at absorbing that element,
but less capable of absorbing others. They crumble into useless
powder when destroyed.

If you bloodcast this spell, the resulting crystal skull has
increased capacity to absorb magic.