Carnage x Atrocitus

Massacrade's Origins by MoonKnightFan101:
From the sector 666, comes the Massacrade, the leader of Carnal Lantern Corps. Massacrade grew up on hellish world of torment, as the Guardian Elders were mistaken in sending their robots to patrol the sector, when the robots malfunctioned and caused a genocide on Massacrade's planet, killing his wife and kids in the process. Massacrade went borderline insane from the experience, his supressed psycopathy unravelled and he became sadistic, killing everyone on sight with unyielding rage. To this, Knull the Butcher, Embody of Rage and Hatered sent a ring to Massacrade and Massacrade accepted it. As soon as it attached to his finger, a symbiotic red entity slithered out of the ring and bonded with Massacrade, turning him into even more dangerous villain. Massacrade's only purpose was simple, kill, slaughter and spread his rage filled lantern corps on innocents like blight onto plants and serve his master.

Both characters belong to Marvel and DC respectively.