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Luminous Body
Rapid expansion (Inflation). A phenomenon more simply called "Luminous Body".
An excited state only possessed by True Ancestor royalty. When a True Ancestor's body is completely destroyed by some means, this reaction is said to occur. It was the result of Arcueid, a "small yet massive being", losing the container called 'body' and consequently having the compressed magical energy released, causing the scale of her existence to expand. Arcueid's consciousness exists at the core of the light, but since the barrier called 'body' doesn't exist, it is a state where among the excess amount of magical energy "an image of herself as she imagines it" is projected and diffused.
If a True Ancestor still brimming with magical energy is imperfectly destroyed, it will reemerge through just the energy that had been stored within its body and destroy human settlements in the form of a calamity, as a revenge mechanism. Inflation does not occur with Arcueid having her power stolen by Roa and fatally wasting away, but the Arcueid in Ciel route who killed Roa, was troubled by the bug that was her love for Shiki, and could no longer control her bloodsucking impulse could cause this phenomenon. Or rather, ended up causing it.
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Event Storage
An ability of the True Ancestors, the planet's sense of touch. The conceptual and physical storage of things reared on the planet's surface. Every creature that has appeared on the face of the planet——it is something that requisitions textures.
In terms of Divine Spirits it's an ability on the level of an Authority, but since this an Authority of the planet it is a 'system' rather than a 'skill'. The gravitational sphere that appears at the feet of Arcueid when she had become a luminous body was of a scale great enough to store the entire planet's texture.
Based on these, Event Storage isn't exclusive to Luminous Body and something TAs naturally can do, only that the ability is tremendously amplified when they're on that state.