Natsu the conduit

In Session 6: A wide variety of deeply concerning things, Kiri mentioned that Natsu might be a conduit; someone capable of feats not typically explained by arcane or divine prowess. Conduits instead draw their power from The World of Forms. Natsu was told she should consider visiting the Church of Ascension in order to learn more. Kiri said there were branches in both Lucileastil and Polaris.
In Session 8.5B: Natsu and Thaiva talk to Plato, she and Thaiva Phenol had an extended interview on this topic with Plato.