This guide shows how to Fragment of Childhood Dreams Domain in the game of Genshin Impact 3.0, which was released on 24th August 2022. Genshin Impact 3.0 has a new region name sumeru.
Enter the Domain, then take first right just after encountering the first set of mushroom enemies. You will reach a larger area, drop down and eliminate Ruin Drake sitting over a large flower petal. Here you need to collect three Primeval Rosin to unlock a sealed path.
#1 Primeval Rosin
Defeat Ruin Drake to remove the seal and collect the first Primeval Rosin. This will also shoot a flying dendro object.
#2 Primeval Rosin
Primeval Rosin is confined in a nearby cave. Shoot the previously released flying dendro object to split it in half. Wait for it to stop before shooting again to split. You need to summon Dendrograna from nearby.
Continue doing so until the flying dendro object enters the cave and unlocks the Primeval Rosin for you to collect.
#3 Primeval Rosin
Use the nearby jumping mushroom on the right side to fly further up.
You can collect the last Primeval Rosin from a cave. Defeat all the mushroom enemies nearby to remove the seal around Primeval Rosin.
After collecting three Primeval Rosins, your next task is to unblock the sealed path. Exit the cave where you get #3 Primeval Rosin and jump onto the mushroom to the right.
Next climb to the mushroom further up two levels. You will find a sealed cave with leaves. Activate the mechanism and this will create two transparent bridges and the middle platform float between these bridges.
Use Four Leaf Sigil to jump to the middle platform. As you land on the middle platform, it will float up further to the sealed cave.
In case you missed or fall down from the middle platform, reach the cave on the opposite with a transparent bridge and activate the mechanism to lower the platform.