Velorin wrote from within the Istora elf-settlement during the long centuries of the Lost Ages. She was ancient even by elven reckoning when she completed her major work, and the fragments that survive suggest she had been revising it for four hundred years. Her Treatise on the Turning Planes is the primary source for the mechanics of three-soul death, the Astral's relationship to material mortality, and the flip-side's continuous feeding from the material world. It is also a deeply theological document, which is partly why Oblexan dismissed it as "poetry dressed as cosmology."
Velorin worships Azak (the daemon of time, clairvoyance, and omens), and her entire methodological framework is a consequence of that devotion. Where empiricists like Oblexan insist on material evidence, Velorin reads the cosmos as a text that has been continuously inscribed since before the Early Times. The three-soul death mechanics are part of that text, the cosmos's own grammar, and Azak is the consciousness through which the grammar becomes legible. She therefore treats mythographic sources (oral traditions, dream-records, sacred narratives) as her primary evidence. Her disagreements with Oblexan run deeper than any single fact; what the two of them dispute is the nature of evidence itself.
Her era and theme is cosmology in full: the flip-side structure, the three planes of death (Astral, Malstaris, and the shadow-layer), the daemon lifecycle from mortal to god to forgotten-thing, and the cosmological implications of major historical events (what the Long Winter sent across; what the Laughing Plague meant for the Astral). She is essential for any claim about how the cosmos works and constitutionally incompatible with any scholar who thinks "works" has a purely mechanical answer.