Save farcast state [851]
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Usage:  USE 851

Required aura:   three
Required item:
Time to cast:    seven days

The state where a mage's next cast will be projected to a different
location may be saved with this spell.  A potion will be created
which, upon use, will revive the projected cast state.

For example, a mage establishes that his next spell cast will be based
from Drassa [cx59].  He then issues USE 851 to preserve this state.
Magical potion [8764] is created.  He later issues USE 8764 to drink
the potion.  His next spell will be based from Drassa.

The mage will no longer have a projected cast state after use of this
spell.