Yes, she does.

So maybe the glacies wrote about it? Their belief is that all the gods exist, so they'd have a bit about it too.

Surely. She kept looking

Its not hard to find. Those books have much more detail, because glacies religion is much more complicated.

For once, she's glad.

There's not much more on the Ghostheart itself, but it turns out almost all the dragons believe in some sort of rapture or apocalypse or general just chaos-causing creature similar to the Ghostheart.

She found that curious

So the big creature was one of those things. Probably. It's just hard to guess which one.

Yeah, no kidding.

The most likely one seems like it'd be The Nothing. It's basically a personified version of a gigantic, deadly plague which will one day kill everything in the Mainland. It's supposed to be gigantic, covered in clouds, and is supposedly a giant wolf.