@Ruwyna There seems to be some confusion about what you're trying to do.
You said upgrade, but if you meant upgrade or evolve. This is a very common area of confusion.
If upgrading to the benefits of a higher chapter, then need the Royal Restoration instants, but also recognized in new chapter (as
@samidodamage described).
If wanting to evolve the Owl, such as from stage 2 to stage 3 or stage 5 to stage 6, then you'd need Artifacts (which are not available in the Spire or for crafting at this time, so watch for them to show up someday)