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I quickly looked into the Yggdrasil's Seedling after everything the Great Spirit explained to me. It had become even larger now in explanations, containing many abilities within as well.
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[Yggdryad's World Tree Seedling (Divine Grade): Level 3]
A Divine Tree created when a Yggdryad is born, its core and body is connected to them and its safety and health is dependent in the Yggdryad and vice versa. However, the tree can also exist without the Yggdryad as long as it grows big enough. The Divine Tree has the properties to one day evolve into the powerful and enormous World Tree, capable of bringing life to everywhere within the world and save it from the darkness.
Check "The Protagnist's Sister Is Actually the Strongest"!