The Egg of God is an alchemical device created by the Lords of Alchemy through years of research into the studies of modern science and ancient alchemy. The purpose of the egg is to birth a new god to destroy the current world and make a new one. Two Eggs of God were known to exist, a prototype that Lovelace was forced into to create a flawed prototype of a god, which Ryu Hayabusa defeated and killed.
The second Egg of God was stored on the Black Narwhal and infused with a DNA sample of Ryu Hayabusa's bloodline, the Dragon Lineage, with Canna, the daughter of Saya, the Lords of Alchemy's original choice of a vessel for their new god. Canna transformed into a gigantic deity, The Goddess, and wielded a massive, purified Dragon Sword, able to wield the blade due to containing Ryu's blood.