Meteor Shower is in air. Circled in black are the meteors falling down.
Meteor Shower is the upgrade to Infernos's Fire Rain. Once activated, flaming meteors come raining down from the sky, doing increased damage. Plus, the burning rocks stay on the ground for some time, dealing burn to any enemy that steps on the rocks, similar to Magikill's Electric Wall. However, the rocks from Meteor Shower once attached to the ground do not hit aerial units, only the falling fireballs do, which inflict little to no damage.
Meteors lay on the ground. Continuously burning any enemy unit standing on it.