The Yggdragon's Seven Divinity Fragments
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From what we learned from Titania back then, we learned that Yggdrasil's true form was the Yggdragon, the first "perfect creation" of the Gods after Erebus, the "imperfect creation".
"Instead of his chaotic mix of elements which the Gods were trying to make to create something like an ultimate god, Yggdragon was made true carefully mixing the essence of the Gods, not by going overboard as before." Granny explained.
"Apparently, this created a balance. The Yggdragon was a being of utter purity, and also the God's connection with the mortal world, as it possessed a physical, non-ethereal body. She, or he, was perfect in everything. Having inherited a part of every god's divinity, they birthed the three Ancient Tribes, the Divine Dragons, the Ancient High Elves, and the Majin by combining their Life Force with the God's Divine Essence."