The Archdemon Of Lust, Lilith
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The entity that was lurking within the depths of the Elios Garden was nobody else than Lilith herself. Or well, one of her Incarnations, a Vessel of the Archdemon of Lust. Something she had been creating for the last five years in hopes of completely destroying everything Blake loved, and also to gain a large area to dominate. She had learned that the best suitable vessels for her were not just another demon, but the monster plants of this world.
Using her powers and influence, she forcefully possessed a young plant monster named Hamadryad, Dryad-like plant creatures that held humanoid forms and some sort of intelligence, although they were still very aggressive. Why? Because it had the most affinity with her. Hamadryads utilize the power of pheromones they produce to control other plant monsters.