Saarelainens' power must be draconic
We know that the 7 gnoses were made from the remains of the third descender.
We know that in the "Hymns of the far North" it is indicated that Saarelainen was carved into 7 piesces.
In Fontaine's Archon quest finale Neuvillette says: "...when The First Usurper arrived on Teyvat, they seized a part of the dragons' power. Today that stolen power is the basis of the Archons' Authoroties (the 7 gnoses)."
So according to that the 3rd descender=Saarelainen=the origin/holder of the dragons' power.
But how can a 3rd descender have dragons' power when the dragons were the original natives of Teyvat before humans? Generally descenders are defined as outsiders from the sea of stars with a will strong enough to rival the world. But how can an outsider then behold the power native to Teyvat (in speculation)?