Ajak was an Eternal created by the Celestials in the World Forge. Over the course of her existence she aided the birth of many Celestials by protecting the native population of the planet.

While on a mission to do the same on Earth Ajak was granted the role of Prime Eternal able to speak with Arishem. Because of this role she learned that every time that the Eternals carried out a Convergence on a separate planet, the birth of a Celestial, that their minds were wiped and they were place on a new planet without any information about what would happen to it in the future.

Staying true to her role, Ajak led the Eternals in their mission to eliminate the Deviants while also not interfering in strictly human affairs. She did this for thousands of years until the final Deviants, in Tenochtitlan, were eliminated. There she declared that the group was free to split up until it was time to return to their supposed home of Olympia although was really referencing the Convergence.