The Rhythm that Leads to the Gloomy Path is a Sumeru World Quest that’s part of the Aranyaka: Part II - Dream Nursery World Questline. After getting rid of the Withering inside the Gloomy Path in the woods, you’ll be asked to investigate the trees inside Ashvattha’s Concourse. Arama will then prompt you to enter the Vasara Tree’s dream in order to find the Vasoma Fruit.
How to complete the Ashvattha’s Concourse Vasara Tree Dream Domain in The Rhythm that Leads to the Gloomy Path Sumeru World Quest in Genshin Impact
Follow the quest marker to the giant tree at the back of the cavern, then interact with the glowing Investigate spot to prompt dialogue with Arama. Make sure to prepare a battle-ready team with at least one Dendro character and one bow user, then select the dialogue option (Reach your hand out to the Vasara Tree…) to be teleported to the Domain.
Inside the Domain, get rid of all the fungi in the clearing to unlock the first Primeval Rosin. Don’t forget to interact with the plant to pick it up! Once that’s done, use the Vintage Lyre in front of the hollow tree to play the Rhythm of the Gloomy Path: mi > re > mi > re > la. Go through the portal and complete the Dendrograna archery puzzle. The Auspicious Branch can be found inside the cave to the right—make sure to defeat the fungi in the way.
After completing the puzzle by shooting at the floating objects with Dendrograna, the barrier locking the Primeval Rosin will disappear. Interact with the plant to obtain the second Primeval Rosin. Next, enter the cave beside the portal. Head to the leftmost entrance to find a clearing with fungi and a Common Chest. Defeat all the enemies to loot it.
Once that's done, head to the other entrance and defeat all the fungi once again. After that, use the Vintage Lyre in front of the hollow tree to play the Rhythm of the Gloomy Path: mi > re > mi > re > la. Go through the portal and interact with the mushroom in front of you to spawn a bridge. Cross the bridge to the other side.
You’ll land in front of some bushes. Use a Normal Attack to get rid of the leaves in the way, opening up the path leading to the third and final Primeval Rosin. Don’t forget to pick it up! Once done, interact with the mushroom to spawn Four-Leaf Sigils. Use the Four-Leaf Sigils to propel yourself upward, until you reach the orange gate.
Stand in front of the orange gate until all three Primeval Rosins merge with it, then interact with it to Activate. Enter the pathway that will open up and defeat the Cast Nightmare, as well as the other fungi that spawn. Once you’re done, pick up the Vasoma Fruit beside Arama to complete the World Quest.
After completing all three Rhythm World Quests are done, you'll get the Wonders of the World Achievement called The Rule of Three.
Check out our Genshin Impact Varuna Gatha World Quest guide to initiate another Aranara questline.