Feat Description[]
In episode 1, Linze casts a spell called Ignis Fire, creating a massive column of fire on top of a wolf.
Calculation[]
Since Linze's far closer to the camera than the wolf, it's probably best to get the wolf's size from another scene and scale using that. So here's a scene moments later of Elze and Linze standing next to the dead wolves. The wolf's standing height, measured through its straighter hind legs, is 245 pixels, to Elze's height of 377 pixels. Elze's 156cm tall according to the wiki which sources this tweet, presumably from the author. Making the wolf's height 101.38cm.
Here I tried measuring to about the top of the wolf's head, ignoring its tail, finding it to be 159 pixels tall, making each pixel in this scene 0.638cm.
The diameter of the column, aiming to measure the entire firey glow and the rings, not just the especially dense column in the middle, is 471 pixels, or 300.5cm, with a radius half that, of 150.25cm.
The height of the column, although it extends off-screen to an unknown extent, is at least 752 pixels, or 479.8cm.
Using volume of a cylinder (π*r^2*h) gives a volume of 3.403e7 cm^3, or 34.03 m^3.
Multiplying this by the density of flame (0.3kg/m^3) gives the fire a mass of 10.21 kg.
Using "Specific heat capacity (Cp) air at 0°C and 1 bara" air has a specific heat capacity of 1006 J/kgK
Assuming the heat change for the fire is 1134C, for normal fire in the range of 1100-1200C, we now have everything we need to get the energy of this.
Result[]
Using the specific heat calculator with these inputs gives a result of 1.165e7 Joules (9-B, Wall level+)