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. This involves presenting two Pyrophosphorites (obtained during the Palace of the Vision Serpent Quest) to the Altar of Primal of Flame. This offering unlocks access 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.
Acquiring the Four Burning Firestones:
Burning Firestone #1:
The first Firestone is obtained automatically during a cutscene with Bona and the Little One. Follow the Little One across the bridge (using a lift mechanism) and interact with the Saurian before speaking to Bona.
Burning Firestone #2:
The second Firestone is located on the northeastern isle. This requires manipulating floating island mechanisms, crossing bridges, using a lift, and defeating an enemy. Along the way, collect a Common and an Exquisite chest. Finally, interact with a mechanism to open a gate, access the Saurian, and return to the altar.
Burning Firestone #3:
To obtain the third Firestone, manipulate floating island mechanisms to access the northern isle's lower level. Follow the Little One, observe a Secret Source Sentinel transporting the Firestone to the southwestern isle, and utilize a Qucusaurus to reach it. Activate mechanisms, use the Qucusaurus to reach an unlocked door, and use an elevator before interacting with the Saurian and returning to the altar via a lift.
Burning Firestone #4:
The final Firestone is on the northwestern isle’s upper level. Use a bridge (tilting it with Bona's help), glide, and lower a lift to reach the Little One. Defeat enemies, collect a Precious chest, and return to the Altar of Primal of Flame with the Saurian.
Once all four Firestones are collected and offered, the Flowing Primal Flame Quest concludes, transforming the Jade of Return into a Golden Entreaty. A cutscene introduces the Dragon of the City of Flowing Ash, leading to the Nursery of Nightmares and completion of The Other Side of the Sky Quest, rewarding players with 50 Primogems.
