The Feat is in Anakaris’ Darkstalkers 3 ending. In short, he takes his entire country, and brings it 5000 years into the future. This includes all the pyramids, the people, and the other structures. The Graphic File very explicitly states it disappears off the face of the Earth and treats its sudden and immediate disappearance as a historical mystery.

Anakaris clearly moves and manipulates the buildings when he pulls them underground into the future. Which we should be able to quantify via KE or PE.

Bare Minimum Weight & PE

There are between 118 & 138 known Egyptian Pyramids to have existed.

The heaviest is 5,216,308,000 kg, but obviously not all of them are this heavy. It seems fairest to take the total volumes from this list, and average them out. Note that the list is incomplete, but it's the best we could find. If anyone has a more complete list with the volumes, or a different idea in mind, we’re all ears.

Total cubic volume from the list (meters): 11626896 m^3

Divide that by 28 (the number of pyramids with listed volumes)

Average Cubic Volume: 415246.2857142857 m^3

1 cubic meter of limestone is 2,711 kg

415246.2857142857 * 2711 = 1125732680.571429 kg

Then we multiply that by the number of known pyramids in Egypt.

1125732680.571429 * 138 = 155,351,109,918.857202 kg

Collective Pyramid Weight: 155,351,109,918.857202 kg

The population of Egypt during 3000 B.C.E is estimated to be 1 to 1.5 million people. In Darkstalkers lore, Anakaris ruled in the century of 2600 B.C.E, where Egypt became more prosperous (and thus more populated), so this should, again, be a good low-end.

The average height of Egyptian citizens was 157.5cm for women and 167.9cm for men. There are no statistics on their weight, but I'll take the average of those (162.7 cm), and get the average weight of someone that height.

According to here, a 'normal' B.M.I for someone who is 162.7 cm would be about 60 kg.

1,000,000 * 60 = 60000000 kg

Finally, we’re going to get the weight of the other buildings. We unfortunately can’t count every building in ancient Egypt at the time. It was recommended we take the aforementioned population, divide it by 4 (assuming the average home has 4 people in it), and use the collective weight of those residential buildings. Granted, some peasant/lower class residents lived in considerably smaller housing.

However, this will still be excluding temples, the much larger elite houses, and famous structures like the Alexandria Library. Not to mention the numerous shops, and other non-residential structures that Egypt would have had at the time. So this will still be low-balling it considerably.

Common Ancient Egyptian houses were made from clay bricks. The Density of clay bricks is 2403 kg/m³.

A typical working class house was composed of 4 rudimentary rooms. They would sometimes have 2 floors, but I’ll be sticking to one to keep things simple. A story of a building is about 4.3 meters. I can’t find too many sources on the exact measurements of most houses, so I’ll compare that height to the width of the entrance in this 3D recreation.

Using the diagram and pictures in the same slide show, I’ll get the size of the structure. These houses were cube-shaped, so the volume of a simple cube will be fine.

House Height (Green): 147 px/4.3m

1px = 0.0292517006802721 meters

Entrance Width (Purple): 447px/13.075 meters

Entrance Width (Purple): 133px/13.075 meters

1px = 0.0983082706766917 meters

Entrance Length (Purple): 85px/8.36

Living Room Width (Green): 197px/19.37

Living Room Length (Green): 157px/15.43

All Purposes Room Width (Blue): 133px/13.075

All Purposes Room Length (Blue): 176px/17.30

Kitchen Width (Red): 90px/8.85

Kitchen Length (Red): 92px/9.04

Entrance Volume:

Entrance Volume: 470.02 M^3

Living Room Volume: 1285.18 M^3

All Purposes Room Volume: 972.65 M^3

Kitchen Volume: 344.02 M^3

Total Volume: 3071.87 M^3

Multiply by .2 to account for empty space

614374000 cm^3

614.374 * 250,000 = 153,593,500 M^3

614,374,000 * 2403 = 369,085,180,500 kg

Total Collective weight of Egypt: 1631751831918.85 kg

Lastly, to get the height of the tallest structure and solving for Potential Energy. The pyramid of Giza is 139 meters tall. Anakaris’ should be comparable, if not much larger.

Solving for Potential Energy gives us...

7006545916555236 joules or 1.67 Megatons of TNT

Scaled to the size of Anakaris’ Labor Force

Page 141 of the Darkstalkers Graphic File has a very important piece of info.

"B.C 2634: Anakaris' pyramid completed after 16 years with the efforts of 60,000,000 laborers"

Basically, Anakaris’ country should have a population way larger than 1 to 1.5 million. He used the effort of 60 million laborers for just his one pyramid. So, we can redo the values factoring this in. This will still be a massive lowball since, again, it’s only factoring in the 60,000,000 laborers, rather than the entire population.

The collective pyramid weight remains the same.

Collective Pyramid Weight: 155,351,109,918.857202 kg

Population Weight: 3600000000 kg

Residential Homes Weight

614.374 * 20,000,000 = 12,287,480,000

12,287,480,000 * 2403 = 29,526,814,440,000 kg

Total Weight: 29,685,765,549,918.857202 kg

Height: 139 m

Plugged in for PE again gives…

396560820720958241 joules or 94.78 Megatons of TNT

Final Revision

Once again using the 60,000,000 laborers statement, but this time to upscale the full population of Anakaris’ country.

https://www.pbs.org/wgbh/nova/article/who-built-the-pyramids/ 

It's estimated anywhere between 20,000 and 30,000 laborers in real life ancient Egypt were used to construct the pyramids. And Egypt's own population at the time is estimated to be between 1 million and 1.5 million. So, essentially the laborers who built the pyramids composed roughly 2% of the population at the time.

Meaning the 60,000,000 laborers compose about 2% of Anakaris' kingdom, and the real population would be around 50x that (3,000,000,000).

It might seem a bit absurd, but it's pretty well-established Anakaris' Egypt was incredibly prosperous. Basically an ancient super civilization. So it's not unbelievable that it would have a population comparable to one of our larger modern countries. Because it was incredibly prosperous at the time, it also wouldn't make sense for the bulk of its population to consist of low-class laborers. There logically would be a good portion of the population doing other things.

Collective Pyramid Weight: 155,351,109,918.857202 kg

Population Weight:

3,000,000,000 * 60 = 180,000,000,000 kg

Residential Homes Weight

614.374 * 750,000,000 = 460,780,500,000

460,780,500,000 * 2403 = 1,107,255,541,500,000 kg

Total Weight: 1107871673109918.857 kg

Plugged in for Potential Energy again gives…

14799635172055431168 joules or 3.537 Gigatons of TNT

Results

Low End: 1.67 Megatons of TNT

Mid End: 94.78 Megatons of TNT

High End: 3.537 Gigatons of TNT