A fey dies in the first world. What next?

[Mulet]

So the party killed a Fey being, in the first world.

It will re-spawn after a while. Where? How? What does it look like?

I've run this as it being asleep, and made of golden light until it solidifies into the fey creature. This was at the Fey's house, and the party was there. So they killed it mid-respawn.

Any material on this I can draw from?

[Tacticslion]

Kingmaker has a lot about fey somewhere in it. Maybe that thing?
(That's all I know about it.)

On the other hand, I hear Pyramid of the Sky Pharo has information as well (specifically a River of Souls article), and I hear that doesn't entirely synch up with the Kingmaker stuff (though I don't know) - so that's another option.

Hope that helps!