Disclaimer[]
All credits go Vivi Ornitier aka ProtoDude; from Naruto Forums.
Edit: And thanks to ZanyBrainy2000 for the reminder on updated guidelines.
The Calc[]
Due to game mechanics, the meteor's size is rather inconsistent, but FE5's illustrations for Battle of Belhalla seems to give better scaling.
Meteor is a bit cut off on both sides, especially vertically due to being dug into the ground, but it appears to be spherical.
242 / 72 = 3.36111111
3.36111111 * 1.7 = 5.71388889 meters in diameter or 2.85694444 meters in radius
V = 4/3πr^3
4/3 * π * 2.85694444^3 = 97.677378 m^3
Density of meteor is ranges from 3000 to 3700 kg/m^3; averaging that would be 3350 kg/m^3
97.677378 * 3350 = 327219.2163 kg
Meteor does not break apart due to ablation or anything, and it appears to take place during the daytime so I will be using 20,000 m/s for the speed; additionally, it is a Fire Elemental attack and has a fireball effect. Which generally means it enters the atmosphere at great speeds; further supporting the 20,000 m/s (of note is the fact that more or less the entire cast can react to these meteors at endgame levels)
0.5 * 327219.2163 * 20000^2 = 6.5443843 * 10^13 joules or 15.641453934 kilotons of TNT equivalent so finally we have. That is Town level
It's consistent with Bolganone, so it's no outlier. And FE characters already scale to better speed feats as well.
This also scales to everyone in Fire Emblems 1, 2, 3, 4, 5, 11, 12, 13, 14, and 15. Likely 9 and 10, but they're being question to scale to an even better calc.
Final Tally[]
Town level and 7-C