"Sparior sȳndrilla Rhaegal issa?"

Translation: Which color is Rhaegal?

[Koen486171]

why not "skorior", since a color is inanimate?

[RossWakefi]

It's referring to Rhaegal (i.e. in the nominative form, as that's how 'issa' works when used as a verb), so as Rhaegal is animate, we use sparior

[NR-65801]

Rhagal kastrys issa