Enemy artillery boulders that crack open on impact and trail green poison fumes across the battlefield.
A group of poison-infused rocks crashes down around Carl's squad during The Charge, cracking, breaking, and rolling while trailing fumes that turn the battlefield smoke a green hue. The impacts shower shrapnel, which pings against Carl's stacked shields like fireflies — a detail that sends his mind incongruously to his grandparents' house in Texas, where fireflies lived and Washington's didn't.
The rocks are one of several escalating artillery types the enemy cycles through, alongside orange-tinged high-tech grenades and, later, Flaming Rocks that spin and roll burning through the smoke.
Large boulders that crack and shatter on landing, leaking green poison fumes and throwing shrapnel.
Enemy area-denial artillery used against the crawler charge.