I want to ask something (SPOILERS FOR EW MSQ)

[PerrinTaveren]

There are gaps in the world's aether, which is where dynamis can more strongly influence things. Darkness is about growth and change, meaning that while he's doing what he's doing those gaps are not left open long enough, if at all, for her to do anything.
The sundering was more a double edged deal not entirely relevant to what Zodiark was doing if I recall correctly, wasn't fully awake by the time some of the stuff was explained. By reducing the aether that people have they become more vulnerable to dynamis, but can also make use of it to have a fighting chance.

that would suggest aether is more powerful than dynamis since dynamis cannot effect the places where aether is strong. but then again it corrupts people's aether and turn them into beasts. so it suggests it can destroy aether within people but it cannot destroy world's aether?

[Raige]

yeah i get that but i don't get why zodiark prevented final days. like what did he actually do? we were just said "it was summoned and that stopped final days" but how? if final days is caused by a different force that being dynamis, what do they do to stop it?

The astral aether, the most outer source of the planet was weakened during the events on the moon. Not sure if i should continue as it would reach level 90 territory.

Think of the aether sorrounding the planet as a protective shield against influences from space. Kinda like our magnetic field on earth.

SPOILERS
As Sorimachi87 touches on, Aether cannot interact with Dynamis and Dynamis cannot permeate dense Aether. Zodiark was an Aether producing battery providing a shield to not allow the Dynamis energies to to seep into our world. Once that shield was removed, as you know, the effects of Dynamis and bird girl's influence over it started taking form on our world.

[Limecat]

Think of it like a preserved specimen in a jar. The specimen itself will start rotting as soon as it can given the chance. So, you toss it into some formaldehyde to stop that. However, the formaldehyde itself will evaporate or react with time, preventing it from preserving the specimen. To stop that you put both inside a sealed glass jar. If you haven't guessed yet, the world is the specimen, Zodiark is the the formaldehyde, and Hydaelyn is the jar.

[EusisLandale]

that would suggest aether is more powerful than dynamis since dynamis cannot effect the places where aether is strong. but then again it corrupts people's aether and turn them into beasts. so it suggests it can destroy aether within people but it cannot destroy world's aether?

Aether is more powerful only due to the volume of it. Think of it like water and fire. A little bit of water will be evaporated by fire, a lot of water will douse the fire. All dynamis could do to the ancients was cause misfiring of their magics, which admittedly can be pretty awful when said magic is "playing god". Modern people, lacking in aether, can be torn apart by it instead. This is why it's double edged that they're sundered. Less aether means crap like that happens once the planet's aether is out of the way by removing Zodiark, but on the other hand it's why there's even a chance to fight back since modern people can make use of dynamis themselves.

[wereotter]

I may be dumb to understand but there is something that bugs me. We are told Zodiark has been summoned to prevent the final days. But the flashback confirmed it kinda didn't?

Actually this felt a little inconsistent to me too. When Venat does the sundering (I assume as Hydalen since the sundering was her doing) we see the fiery skies of the final days overhead, but Zodiark was supposed to have prevented that, restoring life back to normalcy. As I understood it, Hydalen didn't sunder the world until after more human sacrifices to Zodiark were being demanded.

[van_arn]

Actually this felt a little inconsistent to me too. When Venat does the sundering (I assume as Hydalen since the sundering was her doing) we see the fiery skies of the final days overhead, but Zodiark was supposed to have prevented that, restoring life back to normalcy. As I understood it, Hydalen didn't sunder the world until after more human sacrifices to Zodiark were being demanded.

This cutscene takes place when Venat is still Venat. Her Hydaelyn-tier Sundering would be an order of magnitude more powerful than her sundering as Venat.

I believe this scene is only meant to show the moment where she begins to show opposition.

[PerrinTaveren]

I still feel like they needed a villain other than Zodiark and (Hydaelyn) and made up this dynamis. Cause it isn't explained how dense dynamis is at all. We are just old she has sisters but we aren't told how they are created by Hermes. Like, how can you even create something from dynamis? It is just told it is an experimental creation by Hermes. But how can she be this strong if she is a lil tiny bit of dynamis herself that she can literally bring the end of the world? I mean we are told there is this another kinda energy at world called dynamis but we aren't told how large that energy is. Also, if we assume Zodiark was created by the "intention" to stop final days, it is logical it will since it is a primal and intention is key for summoning them (i think). But then again, why did they fear it and needed to keep it in check by creating Hydaelyn? In the flashback, it seemed like Venat just decided to create Hydaelyn just because. I think i just need to accept this is the plot.

[wereotter]

This cutscene takes place when Venat is still Venat. Her Hydaelyn-tier Sundering would be an order of magnitude more powerful than her sundering as Venat.

I believe this scene is only meant to show the moment where she begins to show opposition.

Shouldn't the skies still have been back to normal, though? Or are you saying this was her beginning her opposition at the initial summoning of Zodiark?

[PerrinTaveren]

Actually this felt a little inconsistent to me too. When Venat does the sundering (I assume as Hydalen since the sundering was her doing) we see the fiery skies of the final days overhead, but Zodiark was supposed to have prevented that, restoring life back to normalcy. As I understood it, Hydalen didn't sunder the world until after more human sacrifices to Zodiark were being demanded.

yeah that was where i was confused too. since there were final days after they created zodiark in that flashback and people were literally praying for zodiark to stop it and bring back the paradise they had. so i don't get how imprisoning zodiark made a change. it is hinted summoning hydaelyn stopped it maybe? but then again, how is the question. since after she took matter in her hands, world is saved. But we don't know how.

[EusisLandale]

I still feel like they needed a villain other than Zodiark and (Hydaelyn) and made up this dynamis. Cause it isn't explained how dense dynamis is at all. We are just old she has sisters but we aren't told how they are created by Hermes. Like, how can you even create something from dynamis? It is just told it is an experimental creation by Hermes. But how can she be this strong if she is a lil tiny bit of dynamis herself that she can literally bring the end of the world? I mean we are told there is this another kinda energy at world called dynamis but we aren't told how large that energy is. Also, if we assume Zodiark was created by the "intention" to stop final days, it is logical it will since it is a primal and intention is key for summoning them (i think). But then again, why did they fear it and needed to keep it in check by creating Hydaelyn? In the flashback, it seemed like Venat just decided to create Hydaelyn just because. I think i just need to accept this is the plot.

Meteon wasn't made of dynamis, she was made intentionally light on aether so that she could make use of dynamis.
Zodiark is there to promote dark aether, growth. Left unchecked that would be destructive as well, see the Void. Hydaelyn being weaker than him is actually important as that allows her light aether, stasis, to only slow him down rather than turn everything into a mess like the First.