Requiring superhuman effort, Formidable, as a task

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Possible Answers: HERCULEAN.

Random information on the term “HERCULEAN”:

In Greek mythology the primordial deities are the first entities or beings that come into existence. They form the very fabric of the universe and as such are immortal. These deities are a group of gods from which all the other gods descend. They preceded the Titans, the descendants of Gaia and Uranus.
Taken from Wikipedia