In Aot, Devil Of All Earth (Japanese : Da Di noE Mo, Hepburn : Daichi No Akuma?), The creature is believed to have given Ymir the power of the titans. During the Great Titan War, he would have been killed.
LEGEND Devil Of All Earth Aot
According to Mahr legend, Ymir Fritz made a pact to gain the power of the titans. Helos, the Earth Demon was killed by Helos during the Great Titan War. This saved humanity and forced the Eldians into Paradise.
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TRUE Devil Of All Earth Aot

It was around a thousand years ago that the parasite first appeared.
Ymir, a young girl who was a slave and had her tongue removed, was released by the Eldians to be hunted down. A hollow tree was filled with liquid, and she discovered that there was a white creature living in it. This creature gave her the power to the titans.
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DESCRIPTION
EARTH DEMON Devil Of All Earth Aot

Two ways to represent the Earth Demon are possible. In addition, The first depicts him with a skeletal head and hood. The second shows him demon-like with pointed ears, goat horns and clawed fingers.
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Arc Marley
Tybur and his family visit to Liberio. Willy Tybur stops by a Marleyan estate in order to see the statue of Helos who killed the Devil.
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PARASITE Devil Of All Earth Aot

Parasite is a white spine with mandibles.
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NOTES
- The “parasite”, which looks like Hallucigenia (a prehistoric animal whose existence remains uncertain), is similar to the “parasite”.
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