The following contains major spoilers for Carnage #6, available now from Marvel Comics.
Carnage #6 reveals the true extent of Carnage's deadly power as Rosvelg the Sin-Crier, a monster of Hela, is completely overpowered by the symbiote's evil nature and witnesses a vision of Nidavellir's destruction.
The moment occurs halfway through the issue as Carnage and his new disciple, serial killer Kenneth Neely, trek through Hel on a mission to seize the power of Malkeith the Accursed. Their journey brings them face-to-face with a legion of Hela's troops, and Rosvelg -- a deity resembling a cross between a gryphon and a dragon -- descends upon both trespassers.
The Death of Rosvelg
Rosvelg enters Kenneth's mind, making the killer bear witness to all of his crimes over the years. Carnage comes to the rescue, however, weaving tendrils into Rosvelg and inviting the creature to investigate the depths of his wickedness.
The resulting visions are too much for even Rosvelg, a creature that feeds off of evil, to bear: "At first, he is overcome with joy. With relish he will cry these sins upon the sinner, he thinks to himself. Then, as he nears his fill, he begins to realize this is only the beginning. A mere drop in an ocean of depravity now pouring down his throat. Stop. He wants it to stop."
Rosvelg's mind is utterly fractured, but not before the god-creature sees a glimpse of Carnage destroying Nidavellir, one of the Ten Realms and the home of the dwarves in Marvel's cosmic mythology. Hela also bears witness to this horrific sight via one of her minions, and smiles, planning to use Carnage for her own nefarious ends.
Whether the annihilation of Nidavellir will truly come to pass remains to be seen, but hot on Carnage's pursuit is Detective Jonathan Shayde, who is guided by a sliver of the consciousness of Cletus Kassidy, Carnage's former host. Jonathan ends the issue by freeing Malekith the Accused before Carnage and Kenneth can reach the dark elf, hinting that the two will likely become unusual bedfellows in the impending war against the bloodthirsty symbiote.
Carnage #6 is written by Ram V, illustrated by Roge Antonio, colored by Erick Arciniega and lettered by VC's Joe Sabino. The issue sports a main cover by Kendrick "Kunkka" Lim and a variant cover by Declan Shalvey. Carnage #6 is on sale now from Marvel.