DEMON SUMMONING INCANTATIONS

"_Demon's Name_, in the name of those who were and will be, rise from your eternal slumber once more. As it is by my will that you are returned, make my will your desire, and take my enemies as your own until none remain." (You could add "So mote it be" at the end.)

There is a nice, non-working, incantation in pretty plain English. That little "until none remain" caveat even gives you some plot leeway where you could have the creature turn back on the one calling it if all his enemies appear to be defeated. That would be a hell of a puzzle boss. Fake your own death to have the boss destroyed by his own thrall.


EDIT -
Here is something a Google search turned up in about a second:
http://www.webconferencia.net/charmed/book-of-shadows-summoning-spells-304063.html

And another:
http://www.spellsofmagic.com/spells/spiritual_spells/summon_spells/page.html

author=JustRob

author=Max McGee
Just use the damn lesser key. You want cool sounding, it's cool sounding. Can't hurt that it's "real".

I already used lesser key. Well, a small part of it. I cut out all the crap about God and Adam and whatever as that's irrelevant in my game.

Risky.