Question: While Ariva is considered part of Ikass (technically), there is no description of it in the Ikass style guide nor does it have its own; so should it? And which one would be preferable?

I ask because the story The Dead City, featuring Renn Winmoore and Vasilias, takes place almost entirely within Ariva without touching on Ikass itself.

Huh. Ariva should have its own entry... I think... somewhere... right? Hmmm...

Or maybe we were just using Raleris's story as a substitute for an actual plane entry?

This, I think. I don't have an actual entry for Ariva; but there are several interlinked entries for it between Raleris's story, The Dead City, and Vasilias's entry.