Widespread Damage
Scenario = Earth is being invaded (DC or Marvel) by an alien force that is so ridiculously high in number that it completely blocks out the sun and causes a night-like appearance in the sky. Millions of either alien craft or alien creatures fill the sky.
What hero's (or villain's) attack would take out the largest number of them at a single instance?
Obviously this is not a punch or such.
Think:
Supes' breath
Hal Jordan's ring
Hulk's Thunderclap
Black Bolt's shout
Galactus cosmic beam
This type of thing, or whomever you think of.
No magic (would be a bit unfair)