The Crimson Harvest

Disaster / Destruction

In a surprising alliance, a number of the Infernal Primarchs join their legion's forces and bypass the barrier of providence with the help of mortal hands. Invading the mortal realm, the planet Arkos experienced the Crimson Harvest, the largest Infernal presence on the world since before the Cataclysm. The Infernals were eventually repelled back to Ashfell largely in part due to infighting by the people of Arkos, though without the general help of the Ancients.