The Ending Chronicle calcs

Irradiance

Slightly Above Average
First feat is from Volume 14:
First we need the volume of destruction.
The length is given as 1.5 kilometers = 1500m.
The width is given as 400m, so a radius of 200m is assumed.
Modeling the area of destruction as a cylinder we get: pi*200^2*1500 = 188495559.22 m^3 = 1.885e14 cm^3
I will assume 80% hollowness or 20% concrete in the area: 0.2*1.885e14 cm^3 = 3.77e13 cm^3.
The area is noted to implode, not explode, meaning that the fact that the targets "were no more" should indicate that they were dissolved. Given that this is a lightning attack and intense head is indicated it seems plausible to use vaporization.
I will also do a fragmentation low-end, though. Just for the sake of it.

Vaporization is 25700 J/cm^3
Fragmentation is 8 J/cm^3

Vaporization: 25700 J/cm^3 * 3.77e13 cm^3 = 9.6889e17 J = 231.57 Megatons of TNT
Fragmentation: 8 J/cm^3 * 3.77e13 cm^3 = 3.016e14 J = 72 Kilotons of TNT
 

Irradiance

Slightly Above Average
Another feat from Volume 14. This time from best girl Noah.
Two ways to calculate that. Destruction or explosion calcs.
Let's start with the explosion method. Nuke calculator says: 10km radius explosion equals 51 megatons of TNT.

Next the destruction method. I will assume that the crater is half an elipsoid, with depth 4km and radius 10 km.
Then the volume is 0.5*pi*10km^2*4km = 628.32 km^3 = 6.2832e17 cm^3

Fragmentation is 8 J/cm^3: 8 J/cm^3 * 6.2832e17 cm^3 = 5.02656e18 J = 1.2 Gigatons of TNT
Violent Fragmentation is 69 J/cm^3: 69 J/cm^3 * 6.2832e17 cm^3 = 4.335408e19 J = 10.362 Gigatons of TNT
 

Irradiance

Slightly Above Average
Next feat from Volume 13. We're working backwards.
A several kilometers explosion radius means at least 3. I will also do 5 as a high end.

Nuke calculator time.

3km radius: 1.3 Megatons of TNT
5km radius: 6.3 Megatons of TNT

The results need to be divided by 2, as it were two attacks clashing.

3km: 650 Kilotons of TNT
5km: 3.15 Megatons of TNT
 
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Irradiance

Slightly Above Average
A feat Volume 9 now:
A dozen kilometers from the Black Dragon = 12km radius.

Nuke calculator to the rescue: 89 Megatons of TNT
 
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Irradiance

Slightly Above Average
Second Volume 9 feat
To summarize: Thunderfellow (the mechanical dragon) was 5km away from the automation. Then it flew past her so fast that she couldn't follow it while spinning around.
Automatons are superhumans, so her spinning around shouldn't take too long. 1 second should be an acceptable estimate, given that even a human could do that no problem.
Her vision is superhuman as well, as the quote notes. So for it to disappear from sight we can use peak vision range of a human.
So I will use the 0.02 degrees resolution for her vision, same as is used in this calc.
As the above quote mentions Thunderfellow is 30m.
Hence Angsizing gives us that the range at the end is at least 85.944 km.
At the 5 km it was away from her before he flew past her on top and we get 90.944km = 90944m.

90944m / 1s = 90944 m/s = Mach 265
 
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Irradiance

Slightly Above Average
Forgot a feat from Volume 11, so let's get to that:
Nijun can survive falling from the sky.
Terminal Velocity of a human is at least 200 km/h, which equals 55.555555 m/s
Nijun is chinese (or chinese-based) so I will use average weight of a chinese male, which is 77.7 kg. (or at least China claims that)
Now we can simply do KE: 0.5*77.7*55.5555555^2 = 119907.4 J = 0.03 kg of TNT (Wall level)
 

Irradiance

Slightly Above Average
Since we're out of order anyway, I will follow up with a Volume 1 feat:
Now, a squarical explosion is kinda difficult to calculate. Additionally, it isn't clear whether a "20 meter square" means a square that is 20 square meters or a square with side length of 20 meters, which would mean 400 square meter area.

I will calculate that by assuming it takes the same energy as to cause an explosion of equal area. That's a mid-end between half of side-length and half of diagonal length.

20 m^2 end: pi*r^2 = 20 => r = sqrt(20/pi) = 2.52313252202016m
Plug that into your nuke calculator of choice and you get 0.00073172196238234 Tons of TNT = 3061524.69J

400 m^2 end: pi*r^2 = 400 => r = sqrt(400/pi) = 11.283791670955125m
Once more plugging that into explosion stuff and we get 0.065447201940658355 Tons of TNT
 

Irradiance

Slightly Above Average
Lastly (for now), a feat from Volume 2:
200m radius explosion. Easy.
Standard explosion calculator says 364.431 Tons of TNT.
 

Irradiance

Slightly Above Average
Alright, gonna add a calc here purely because the feat is good even if all characters scaling to it scale to higher shit anyways.
Alright, so Chisato using 25% of her power flew so far away from a 3000m runway in "an instant" that it looked no longer than thirty centimetres.
Now "looking thirty centimetres" is still vague. Thirty centimetres from which distance, right? I will assume from 1 meter away is meant. That is about an arm length away which seems like an acceptable guess for what one means when one says "looks thirty centimetres big".

With that, all we need now is the good old angsizing calculator.
First, we need the angle. So we put 1m as distance and 0.3m (30cm) as size. As result we get 17.062°.
Now we can use that to get the real distance. We enter 17.062° as angle and 3000m as size.
We get 9999.7m.

Next we need a timeframe. It says "instant" and "before she could exhale". 1 second appears to be realistic.
9999.7m / 1s = 9999.7 m/s = Mach 29.15