A series of neon green concentric circles exploded outward from a point in the sky above, rippling out to disappear over each horizon.  Eidolon had engaged one Alexandria-clone, and whatever he’d done seemed to have finished her off.  One left.

...

Another circle exploded across the sky.  Alexandria-clone-two was down.  Legend and Eidolon descended in Echidna’s direction, keeping a healthier distance.

Whatever Eidolon had been hitting the clones with, considering the area it was covering and the fact that it was apparently taking Alexandria out of action, it suggested a kind of attack that couldn’t be used near the ground, because it might have leveled whole sections of the city.

Wildbow, Worm, 19.7