Down in the forest, there is a tree.
What's left of one, anyway.
The Nemeton calls another supernatural creature to its town.
The blood that drips onto it forms a circle.
Ellie provides a circle. Standard bindings, no gag.
A demon appears! "Hi, summoner, what can I do for you? Thanks for letting me talk, I really appreciate that."
"Common courtesy, one daeva to another. And this is a somewhat... unique situation. A friendly demon would be an asset."
"I'm very friendly. What's up?"
"This is not the Earth you are used to. It is an alternate universe in the year 2009, with a magic system entirely unrelated to the one that produced us. A few days ago, a creature of that magic made it possible for summoning to work here."
"Wow, am I ever excited to be in on the ground floor of this opportunity, what's the plan?"
"Some... specialists are dealing with explaining daeva to locally-magic people. We are handling mundane rollout. The Revelation happened before I was born, so I have no direct experience with this. Depending on how comfortable you are with looking up potentially-private information, we want at least textbooks and possibly details about how the original Revelation was achieved."
"So this is real funny but uh I'm actually Revelation."
"I suppose that obviates the privacy concern. Are you willing to do it again?"
"Then if you'll give us your name, we can dismiss you and resummon you with looser bindings."
"Campbell Mark Swan." He spells it.
"I look forward to working with you, Campbell Mark Swan."