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To communicate with an ancient, sentient tree, Lucy Lazarin requires Psygill Mushroom. They're found within Exo-Lab 71: The Arboretum and grow on the Elderoot Deathcap who lurk there. Once aquired, give them to her father, Victor Lazarin, at his laboritory in Elderoot Refuge.
Find the entrance to Exo-Lab 71: The Arboretum and gain access to it. Collect Psygill Mushrooms then head towards Elderoot Refuge. Check in with Queen Myala Everstar and talk with Victor Lazarin.