Though no concept art is known to exist of the creature, the script for Godzilla vs. Red Moon describes Erabus as having glossy skin. When hibernating, she is mistaken for tree with her tail (or perhaps multiple tails) resembling tree roots.  Artwork by artist "Hurricane" Ryu Hariken depicts Erabus as a large-eyed, maned amphibious draconic creature with grasping forelimbs, a noticeably long neck multiple tails, and a finned back covered in scales.
Erabus, long in hibernation, was the home of various long lived pit vipers said to have extended their life by absorbing the "red sap" of the roots of a massive tree.  The tree is in fact a hibernating Erabus.
Erabus emerged from hibernation on Habu Island of Okinawa shortly after Red Moon arrives from the moon. The Japanese Self Defense thought they could lure the two kaiju together so they could defeat each other, but they turn out to be the same species and of opposite genders. They soon have a son dubbed Halfun, who is killed later on. Halfun's parents go berserk and destroy cities, but Godzilla arrives and defeats them.
Erabus has the ability to inhale airborne chemical weapons to store in her body and later exhale against enemies.
Erabus is a rapid burrower, able to quickly vanish without a trace after awakening.
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