Why This Isn't Environmental Destruction
I will now make a case as to why this feat is not environmental destruction as it was previously thought to be.
For starters,
it's a standard KE storm creation feat.
It is no different than our
Bleach and
Naruto storm calcs that give an AP rating.
It is just as applicable in AP as their's. In both Naruto and Bleach, the casters provided the energy needed to create their storms and Esdeath does the exact same thing:
Esdeath's Ice Manipulation is Energy Based
As it is shown multiple times throughout the series, Esdeath's ice powers are based on an internal energy, her own power. She supplies the ice with her own energy that gives them their power.
Ice Storm: Commander-in-Chief Relies on Energy
In order to make the storm, Esdeath did require prep as it required the energy stored in her Ice Calvary in order to be made. Esdeath's words:
"I've been crafting the Ice Calvary for days now. Which means, in one go, I've poured back into myself all that power I've been storing elsewhere..."
To form IS:CIC, Esdeath required the stored energy of her Ice Calvary which as shown above ar made using her own energy and power.
How Many Ice Calvary Did It Require and How Many Can She Make Casually?
Esdeath explicitly made ten thousand of them.
Casually, Esdeath was able to make 4 with a snap of her finger, and possibly
8 at a time up to
63 in a short unknown time when demonstrating to the Emperor.
Esdeath could casually supply 4/10,000th, 8/10,000th or 63/10,000th of the energy needed to make the storm. She does not scale to the full yield of the storm, only a fraction that she could casually display.
Look Over of Environmental Destruction
Environmental Destruction describes a character's capability to damage and destroy an area around themselves, but not necessarily their capacity to realistically harm their opponent. In practice, this is essentially a non-combat applicable Attack Potency; if a character is able to cause weather phenomena or natural disasters without any reasoning that can support their other statistics being at this level of destructive potency, then they should have trouble or lack the capacity to use these powers to damage characters in comparable tiers.
That is not to say environmental destruction feats cannot be applied to Attack Potency, Durability, and Striking Strength by any means. This is merely the result of case-by-case analysis, and depending on the context of the feat, may be a defining feat of a verse in question.
As I've shown above, Esdeath is able to consolidate her energy into her ice as she was able to consolidate the energy needed to power her High 6-A storm with 10,000 of her ice creation. She is able to display being able to make a fraction of that number casually, so she scales to that fraction of energy as her powers are energy based.
Bringing this back up because people still keep believing the misconception of prep for Esdeath's High 6-B scaling. The High 6-A 250 petatons for Ice Storm does require prep, but the High 6-B does not as explained.