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 (gathered 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," requiring the collection of four Burning Firestones to acquire the Jade of Return.
Obtaining the Four Burning Firestones:
Burning Firestone Location #1:
Activate the mechanism to the right of the Firestone's location. Ascend the generated platforms to the top floor, defeat the enemy, and open the Exquisite chest. Use the mechanism behind the chest to open the gate, descend to find a Saurian, unlock the door, and request its return to the altar.
Burning Firestone Location #3:
Manipulate the floating island mechanisms (right and north) to create a path. Follow the Saurian, observe the Sentinel move a Firestone, and proceed to the northwestern edge. Transform into a Qucusaurus, 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 Location #4:
Cross the northwestern bridge, use Bona to raise it, glide to the northern isle's upper level, and lower the lift. Follow the Saurian's instructions, defeat the enemy, and retrieve the Precious chest before returning to the altar.
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Completing these steps, and offering all four Firestones at the Altar, finishes "The Flowing Primal Flame" Quest, transforming the Jade of Return. The Dragon of the City of Flowing Ash then appears, leading to the Nursery of Nightmares island to complete "The Other Side of the Sky" and earn 50 Primogems.
