Goetia would be fine, so long as you know who you are talking to, I like runyans theory, that they are ancient gods. But then again that doesn't guarantee they don't go crazy on you...

"So sayeth the lord!"

"Why? were you quoting liber al?"

Goetia? Aw geez, I knew something was wrong when I got Goethe instead.
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So this is what happens when demented people play with powerful toys.