After assisting Bona in purging the Abyssal Corruption from the Chu'ulel Light Core within Genshin Impact, players must aid her in locating the Primal of Flame. Once found, Travelers must present two Pyrophosphorites – acquired 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 fortress. Reaching Tonatiuh completes the To the Sky-Road Quest and initiates The Other Side of the Sky Quest, requiring Travelers to gather four Burning Firestones to obtain the Jade of Return.

Acquiring the Four Burning Firestones in Genshin Impact

Burning Firestone #1

The first Burning Firestone is obtained by:

1. Reaching Tonatiuh.
2. Completing the cutscene with Bona; the Little One will retrieve the first Burning Firestone.
3. Following the Little One to the bridge.
4. Activating the bridge mechanism to raise the lift.
5. Interacting with the small Saurian.
6. Speaking with Bona.
7. Completing another cutscene.

Burning Firestone #2

The second Burning Firestone is located on the northeastern isle. The retrieval process involves:

1. Rotating the right and left floating isle mechanisms.
2. Crossing the extended bridge eastward.
3. Raising the lift.
4. Following the Little One to the second Burning Firestone.
5. Collecting a Common chest en route.
6. Activating the mechanism to the right of the Firestone.
7. Ascending the spawned platforms to the upper level.
8. Defeating the enemy.
9. Obtaining an Exquisite chest atop the tower.
10. Activating the mechanism to open the gate.
11. Descending to the small Saurian.
12. Opening the locked door.
13. Instructing the Little One to return to the altar.
14. Returning to the Altar of Primal of Flame.

Burning Firestone #3

To obtain the third Burning Firestone:

1. Rotate the right and northern floating isle mechanisms.
2. Cross the bridge to the lower level of the northern isle.
3. Follow the Little One.
4. Observe the Secret Source Sentinel carrying the third Burning Firestone to the southwestern isle.
5. Proceed to the northwestern edge.
6. Transform into a Qucusaurus.
7. Fly towards the Pyroculus.
8. Activate the mechanism within the tower.
9. Transform into a Qucusaurus and fly to the unlocked door.
10. Activate the elevator to return to the upper level.
11. Interact with the small Saurian and follow it.
12. Activate the lift.
13. Return to the Altar of Primal of Flame.

Burning Firestone #4

The final Burning Firestone is situated on the northwestern isle’s upper level. To collect it:

1. Cross the northwestern bridge.
2. Request Bona's assistance to raise the bridge.
3. Glide to the upper level of the northern isle.
4. Lower the lift.
5. Follow the Little One.
6. Instruct the Little One to return to the altar.
7. Defeat the spawned enemies.
8. Again, instruct the Saurian to return to the altar.
9. Collect a Precious chest.
10. Return to the Altar of Primal of Flame.

Offering all four Burning Firestones to the Altar completes The Flowing Primal Flame Quest. A cutscene ensues, transforming the Jade of Return into a Golden Entreaty. The Dragon of the City of Flowing Ash then appears, continuing the challenge. Follow the Taunted One to the Nursery of Nightmares island to finish The Other Side of the Sky Quest and receive 50 Primogems.