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The energies of heaven and earth vary greatly, such as the most common strength used by ordinary people.

Then there's the vigor used by martial artists. For cultivators, they can draw upon the spiritual energy between heaven and earth and transform it into a new kind of power.

And beyond that are powers like immortal force, divine force...

However, amid all those powers, only the force of life stands at the very pinnacle.

Because, when cultivated to the extreme, the force of life can achieve a phoenix's nirvana, bring the dead back to life, and forge an Undying True Body.

And as far as is known, the only one with the force of life is the Innate Sovereign among the Tree Demon Race—the Tree of Life.

The Tree Demon King of old, with his eighth-level cultivation, made the Ninth-level Demon Emperor Black Jiao fear to clash head-on with him.