Summons a demon from the deepest abyss. The true name of the demon must be
specified. More information on these individuals and their names can be found
in the order's library. A pentagram must be drawn prior to the casting of the
spell, in which the demon is to appear. If there is as much as a little flaw
in the pentagram, the demon can break free and do as it pleases, often
beginning with slaying its summoner. If the caster manages to keep the demon
in the pentagram, he can ask one favor of the demon before sending it back.
Typical favours are that the demon is to go get an item for the magician,
that it is to slay someone or something, or maybe cast a spell.
Almost needless to say, this is an evil spell.