CreatorJoe asked me to calculate the potential energy of Ogdru Jahad.
In this image, I'm going to be using the general shape of the Ogdru Jahad since they aren't really directly based on any real creatures. Assuming those are mountains to its side, which is what CreatorJoe told me they were, they measure about 270 px. The lower half of Ogdru Jahad measures 519 px, the upper half measures 437 px, and the width measures 478 px. The minimum height of a mountain is 610 m.
(610/270)*519=1172.55555556 m
(610/270)*437=987.296296296 m
(610/270)*478=1079.92592593 m
Using the width as the length as well and using a pyramid formula for both its halves, we get volumes of:
(1172.55555556*1079.92592593^2)/3=455827065.853 m^3
(987.296296296*1079.92592593^2)/3=383808146.006 m^3
Total Volume: 455827065.853+383808146.006=839635211.859 m^3
It's stated in the image that Ogdru Jahad is made of mud so using the density of mud, which according to this steady mud is 1840 kg/m^3. Using this we get a mass of:
839635211.859*1840=1.5449288e+12 kg
Using GPE and its total height, 2159.85185186 m (1172.55555556+987.296296296), we get:
1.5449288e+12*2159.85185186*9.81=3.2734178e+16 J (City level)
Edit[]
So yeah according to Psychomaster35 and like KLOL506 wrote in the comments, gotta divide the total height in half. Total energy is:
1.5449288e+12*(2159.85185186/2)*9.81=1.6367089e+16 J (Small City level+)