Armor Hunters by Robert Venditti

A ruthless band of extraterrestrial hunters descends on Earth to eradicate a living alien armor they deem a universe-threatening plague, issuing an ultimatum that leads to catastrophic attacks and mass panic. Forced into an uneasy alliance, the planet’s elite defenders rally around the armor’s human host to push back against the invaders’ overwhelming firepower and devastating bio-weapons. As the truth behind the armor’s origin surfaces, the battle becomes a moral crucible over survival and responsibility, culminating in a world-shaking clash that saves Earth but leaves lasting scars and a fraught new status quo.