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In terms of general appearance, the unidentified Hollow Earth Titan possesses a skull significantly larger than Godzilla's and does not seem to have limbs. It has sharp teeth with two large prominent upper canine teeth and relatively large front facing optical cavities. Lodged within its skull was a large axe that ancient Titanus Kongs used as weapons.
The unidentified Hollow Earth Titan likely evolved within the Hollow Earth. It likley died within the Hollow Earth Temple from a lethal blow from the aformentioned axe during a battle. While unconfirmed, due to the ancient war mentioned in Godzilla vs. Kong the skeleton may be an ancient Titanus Gojira.
As Kong enters the Hollow Earth Temple, he notices a battle axe wedged within the unidentified Hollow Eath Titan, removes it, holds it up high, and roars proudly while beating his chest, then claims his new weaponized gift.
In the film novelization, the creature is implied to be the remains of Titanus Gojira based on its physical resemblance. This is contradicted by the film, as the creature's skull is noticeably more mammalian than reptilian, possessing elongated canines.
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