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In Ordinal Scale, the final boss of Aincrad creates a lengthy explosion using her eye beams.
First Image
Kirito's Height = 1.72 meter = 49 px
Radius' Length = L meters = 419 px
L=(1.72/49)*419=14.707 meters.
Second image:
Radius' Length = 14.707 meters = 49 px
Explosion's Length = R meters = 503 px
R=(14.707/49)*503=150.979 meters.
Should be easily in the Multi-City Block level range, though I don't know where specifically.