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 fortress. Reaching Tonatiuh completes the To the Sky-Road Quest and begins The Other Side of the Sky Quest, requiring Travelers to gather four Burning Firestones to acquire the Jade of Return.
How to Obtain the Four Burning Firestones in Genshin Impact
Burning Firestone #1:
The first Burning Firestone is obtained automatically during a cutscene with Bona and the Little One after reaching Tonatiuh. Follow the Little One, activate the bridge lift, interact with the Saurian, and speak with Bona.
Burning Firestone #2:
This Firestone is located on the northeastern isle. Rotate the floating isle mechanics, cross the extended bridge, raise the lift, and follow the Little One. Collect a Common chest along the way, activate the mechanism near the Firestone, climb to the upper level, defeat an enemy, and collect an Exquisite chest. Activate the mechanism to open a gate, descend to the Saurian, open the door, and tell the Little One "Let's return to the altar!"Burning Firestone #3:
To collect the third Burning Firestone, rotate the right and northern floating isle mechanics, cross the bridge to the northern isle's lower level, and follow the Little One. Observe the Secret Source Sentinel carrying the Firestone to the southwestern isle. Ride a Qucusaurus to reach the Pyroculus, activate the tower mechanism, transform into a Qucusaurus again, fly to the unlocked door, activate the elevator, interact with the Saurian, follow it, activate the lift, and return to the Altar.Burning Firestone #4:
The final Burning Firestone is on the northwestern isle's upper level. Cross the northwestern bridge, have Bona adjust it, glide to the northern isle's upper level, lower the lift, follow the Little One, instruct it to return to the altar, defeat enemies, and return to the Saurian to go back to the Altar. Collect a Precious chest. Offering all four Firestones to the Altar completes The Flowing Primal Flame Quest. A cutscene transforms the Jade of Return into a Golden Entreaty. The Dragon of the City of Flowing Ash then appears. Follow the Taunted One to the Nursery of Nightmares island to finish The Other Side of the Sky Quest and receive 50 Primogems.
