Story unravelled (sorry SE) (Spoiler: Patch 6.2 - 7.0)

[Tetsujin13]

Good point. But it seems pretty coincidental that a calamity would happen at very specific types of events.

[rainichan]

Good point. But it seems pretty coincidental that a calamity would happen at very specific types of events.

That's how the Ascians rejoined shards into the Source: the Thirteenth was the first that Igeyorhm tried to rejoin and failed at, and instead flooded it with darkness. It wasn't until later that they found the balance of slowly flood a Shard with an element, deprive the Source of that element, and it'll siphon from one of the Shards to regain it, causing some manner of disaster on the Source when the Shard is rejoined since it's flooding the Source with the missing element. Dark and Light are unaspected, since there's no actual element to them like lightning, wind, water, etc. and as said in Shadowbringers, Dark is Astral (always moving, kinetic energy) and Light is Umbral (stasis, unmoving, sluggish). Louisoix stopped the Dark-aligned Calamity from being worse than it was, however a Shard was still rejoined. The 8th Umbral Calamity was stopped completely via the events of Shadowbringers, and as of Endwalker, no more Calamities should happen... hopefully.

Re: saving the 13th, they mentioned doing the same with the 13th as we did on the 1st a lot, and have mentioned Eden plenty. Further in the all ShB 70-80 role quests completed,

we learn that Cyella was the female elezen with Ardbert and she was actually from the 13th. In the follow up quest, you bring Unukalhai to the First to meet with Cyella as he was also from the 13th before the corruption. In some new dialogue post 6.2, both Cylva and Unu are surprised to hear that you've traveled to the 13th and may try to save it.

[Tetsujin13]

It might also be that since all the elements have been represented or activated clock-wise along the ring of the elemental wheel. According to the Eorzea lore book, the three conquerts and three submissions fit very well to the remaining Twelve gods, if we exclude the gods that have been represented already.

By taking into consideration the three conquerts and three submissions, and the nature of the gods that represent the elements left that are associated with these. I propose this possible relationship.

Calamities x Elemental Wheel Sequence:

Flood of Darkness

(Chapter 1)
Astral Wind
Umbral Lightning
Astral Fire
Umbral Earth
Astral Ice
Umbral Water

Flood of Light

(Chapter 2)
Earth grounds Lightning.
Astral Earth / Sustainability (Nophica) protects against Astral Lightning / Unsustainability (Byregot)

Water erodes Earth
Astral Water / Rivers (Thaliak) protects against Astral Earth / Desolation (Nophica)

Lightning boils Water
Astral Lightning / Ingenuity (Byregot) protects against Astral Water / Flooding (Thaliak)

Second flood of Darkness?

(Chapter 3)
Fire is exstinguished by Wind.
Umbral Fire / Condemned Souls (Nald'thal) is stopped by Umbral Wind / Freedom (Oschon)

Ice is melted by Fire.
Umbral Ice / Emotionally troubled (Menphina) is stopped by Umbral Fire / Peace in afterlife (Nald'thal)

Wind is obstructed by Ice.
Umbral Wind / Depression (Oschon) is stopped by Umbral Ice / Love (Menphina)

Second flood of Light?

[Iscah]

Astral Darkness (Flood of Darkness, Corruption?)

Astral Light (Flood of Light, Stasis)

Umbral Darkness (Flood of Madness?)

Umbral Light (Flood of Ignorant Bliss?)

Darkness and light aren't elements but aspects, synonymous with astral/active and umbral/passive energies respectively.

Proposing "astral light and umbral light" as elemental combinations is in the realm of proposing "dry water and wet water".

And the madness and bliss thing has no canon basis to my awareness.

[Tetsujin13]

Darkness and light aren't elements but aspects, synonymous with astral/active and umbral/passive energies respectively.

Proposing "astral light and umbral light" as elemental combinations is in the realm of proposing "dry water and wet water".

And the madness and bliss thing has no canon basis to my awareness.

Noted and corrected the comment.