Aeternitas (Eternity)

Aeternitas was the Roman Goddess and Personification of Eternity, a member of the Aionios and their Motherly-Homely figure, like Hera and Rhea before her she was the glue that kept stability of Aionia Akropoli and the united World together.

Tempus Sceptrum
Aeternitas's Symbol of Power is the Tempus Sceptrum. A Scepter which at its top it holds a "Snake seemingly coiled around an egg", symbolic of the Universal Egg that Chronos was said to have been born from, while the serpent is a sacred symbol of Time.

During times of War, Aeternitas's Scepter can shapeshift into a European Ceremonial Longsword.

Phoenix
Just as Zagreus's Sacred Animals are Dragons, Aeternitas' Sacred Animals are Phoenixes, elegant as Dragons and with the power to burst into flame and be reborn. Just as Zagreus has Megaleio as his male Dragon familiar, Aeternitas has a female Blue Phoenix called Anagennisi.

Trivia

 * In some texts, both Aeternitas and Aion are said to be children of Jupiter.