Calc Elder Scrolls Online - Imperial City Wall gets blown up

14:45
The Altmeri Dominion heroine is used as a conduit by a Ebonheart Pact mage to channel a lighting blast that vaporizes a large number of dremora and blows up a part of the Imperial City Wall. She survives this. The average height of a man is 171cm, or 1.71m.
30 pixels = 1.71m.
1 pixel = 1.71/30 = 0.057m
0.057m X 137 = 7.80900m
0.057m X 848 = 48.33600m
248 pixels = 7.80900m
1 pixel = 7.80900m/248 = 0.0314879032m
0.0314879032m X 127 = 3.99896371m
216 pixels = 7.80900m
1 pixel = 7.80900m/216 = 0.0361527778m
0.0361527778m X 1959 = 70.8232917m

Now to add them all together for our volume, as a rectangle.

V = lhw
= 70.8232917 X 3.99896371 X 48.33600
= 13689.711m^3

Violent fragmentation of rock is 69000000 joules per m^3.

E = 13689.711 X 69000000
= 944590059000 joules
= 225.762442399618 tons of TNT

Final Results
Lightning destroys Imperial City Wall = 225.762 tons of TNT