In Genshin Impact, after assisting Bona in purifying the Abyssal Corruption from the Chu'ulel Light Core, players must help her find the Primal of Flame. Once located, 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 Travelers to gather four Burning Firestones to acquire the Jade of Return.

Obtaining the Four Burning Firestones:

Burning Firestone #1:

The first Firestone is obtained automatically during a cutscene after reaching Tonatiuh. Follow the Little One across the bridge (activating the lift mechanism as needed) and interact with the Saurian and Bona.

Burning Firestone #2:

The second Firestone is on the northeastern island. Rotate the floating island mechanisms to extend the bridge, raise the lift, and follow the Little One. Along the way, collect a Common Chest. Activate the mechanism near the Firestone, climb to the upper level, defeat enemies, and collect an Exquisite Chest. Use the mechanism to open a gate, descend, open a locked door, and ask the Little One to return to the altar.

Burning Firestone #3:

To get the third Firestone, rotate the right and northern island mechanisms, cross the bridge to the northern island’s lower level, and follow the Little One. Observe a Secret Source Sentinel carrying the Firestone to the southwestern island. Use a Qucusaurus to reach the Pyroculus, activate the tower mechanism, and fly to the unlocked door. Use the elevator, interact with the Saurian, activate the lift, and return to the altar.

Burning Firestone #4:

The final Firestone is on the northwestern island’s upper level. Cross the bridge, ask Bona to adjust it, glide to the upper level, lower the lift, and follow the Little One. Ask it to return to the altar, defeat enemies, and collect a Precious Chest before returning to the Altar of Primal of Flame.

Offering all four Firestones to the altar completes The Flowing Primal Flame Quest, transforming the Jade of Return into a Golden Entreaty. The Dragon of the City of Flowing Ash then appears, leading players to the Nursery of Nightmares to finish The Other Side of the Sky Quest and receive 50 Primogems.