In Genshin Impact, after assisting Bona in purifying the Abyssal Corruption from the Chu'ulel Light Core, players must help her locate the Primal of Flame. Once found, travelers must offer two Pyrophosphorites (obtained during the Palace of the Vision Serpent Quest) to the Altar of Primal of Flame. This offering opens a path to Tonatiuh, a floating island above Ochkanatlan’s Cradle of Fleeting Dreams. Reaching Tonatiuh completes the To the Sky-Road Quest and begins The Other Side of the Sky Quest, requiring the collection of four Burning Firestones to acquire the Jade of Return.
How to Obtain the Four Burning Firestones
Burning Firestone #1
The first Burning Firestone is obtained after reaching Tonatiuh. After the cutscene with Bona concludes, the Little One will retrieve the Firestone. Follow the Little One across the raised bridge (using the nearby mechanism), interact with the Saurian, speak with Bona, and watch the subsequent cutscene.
Burning Firestone #2
The second Burning Firestone is located on the northeastern island. Activate the floating island mechanisms (both right and left) to extend the bridge. Raise the lift, follow the Little One to the Firestone, collect a Common Chest along the way, and activate the mechanism near the Firestone. Climb the spawned platforms, defeat the enemy, open an Exquisite Chest, and use the mechanism to open a gate. Descend to the Saurian, unlock the door, tell the Little One "Let's return to the altar!", and return to the Altar of Primal of Flame.
Burning Firestone #3
To obtain the third Burning Firestone: Activate the right and northern floating island mechanisms to create a path to the northern island's lower level. Follow the Little One, observe a Secret Source Sentinel carrying the Firestone to the southwestern island, and proceed to the northwestern edge. Transform into a Qucusaurus, fly to a Pyroculus, activate the tower mechanism, and fly to the unlocked door using the Qucusaurus form. Activate the elevator, interact with the Saurian, follow it, activate the lift, and return to the Altar of Primal of Flame.
Burning Firestone #4
The final Burning Firestone is on the northwestern island's upper level. Cross the northwestern bridge, ask Bona to adjust it, glide to the northern island's upper level, lower the lift, and follow the Little One. Tell it "Let's return to the altar!", defeat the enemies, and ask the Saurian to return to the altar. Collect a Precious Chest, and return to the Altar.
Once all four Firestones are collected and offered, the Flowing Primal Flame Quest is completed. A cutscene will show the Jade of Return transforming into a Golden Entreaty. The Dragon of the City of Flowing Ash will then appear, leading to the Nursery of Nightmares island and the completion of The Other Side of the Sky Quest, rewarding 50 Primogems.
