Avatar of Satan

The Hell Gate Guardian is a demonic created by IDW Publishing that appears in issue #5 of the comic book miniseries Godzilla in Hell.

Appearance
The Hell Gate Guardian is a massive creature that is mostly surrounded by clouds, leaving very little of its body visible. The Guardian has a large rounded head with multiple eyes, tentacles surrounding its mouth, and sharp fangs. Its skin is a grayish color and has a decayed, uneven texture with spikes sprouting from it. The Guardian has several long tentacles that extend down from its perch on the mountain.

Godzilla in Hell
After traversing through a blizzard, a blood waterfall, and a field of stalagmites, Godzilla came upon a huge mountain, where the Guardian guarded the gate from Hell back to the living world. Godzilla blasted the Guardian with his atomic breath, but to no effect. Godzilla then attempted to climb the mountain, but the Guardian caused a landslide and knocked Godzilla back down to the foot of the mountain. Emerging from the rubble, Godzilla seemed to give up and allowed himself to be devoured by the Hellbats that had been following him. After eating Godzilla down to the bone, the Hellbats suddenly grew eyes and began to screech Godzilla's roar, then reformed Godzilla's body around his skeleton. The Hellbat-Godzilla roared at the Guardian, drawing its attention. Every single Hellbat making up Godzilla's body then fired their atomic breath at once, producing a huge Godzilla-sized blast of atomic breath that destroyed the Guardian, allowing Godzilla to scale the mountain and return to the living world.

Trivia

 * The Hell Gate Guardian shares some similarities with the famous H.P. Lovecraft creature, Cthulhu.