The Snake in the Castle
Sheilalev Ortfalcon became a priestess the moment she graduated from Magierstadt. She was granted this high position not just because she was an Ortfalcon. It was because she was a strong Clairvoyant.
Usually, Clairvoyants aren't equipped into battles. They don't even belong to the same spectrum as mages. Clairvoyants are seen as weaker beings. They are born without any compatibility with all of the elements, with only the advantage of being able to foretell the future whilst doing some spells that cannot be conjured by the mages.
In terms of strength and magical power, mages outrank clairvoyants. Even if they cannot conjure the same spell as them, mages make up for that gap by tenfold. Mages can control nature—use the elements to their will. Whilst what do clairvoyants do? Predict the future. And that future predictions are just vague images.