Yolen?

[AvatarOfAdonalsuim]

what system is Yolen placed in, or is it known?

[Honorless he/him]

Yolen is hidden, according to Khriss, and she hasn't been able to find it, so far at least. Though judging by the letters in the epigraphs, Yolen's not completely cut off from Worldhoppers' reach

[Duxredux he/him]

So, not general knowledge but likely known to natives, such as the original Vessels, Hoid, and Frost. If you could convince one of these to reveal the location, you could probably get there.