In Genshin Impact, after assisting Bona in purging the Abyssal Corruption from the Chu'ulel Light Core, the next step is to locate the Primal of Flame. To access Tonatiuh, which hovers above the Cradle of Fleeting Dreams fortress in Ochkanatlan, players must offer two Pyrophosphorites to the Altar of Primal of Flame. These Pyrophosphorites are obtained during the Palace of the Vision Serpent Quest.

Upon reaching Tonatiuh, players will embark on the To the Sky-Road Quest, which leads into The Other Side of the Sky Quest. Here, the collection of four Burning Firestones is crucial for obtaining the Jade of Return. Below is a detailed guide on how to gather these Burning Firestones in Genshin Impact.

Burning Firestone Location #1

To secure the first Burning Firestone in Tonatiuh, follow these steps:

• Arrive at Tonatiuh.
• Watch the cutscene featuring Bona, during which the Little One will automatically collect the first Burning Firestone.
• Accompany the Little One to the bridge.
• Activate the mechanism next to the bridge to elevate the lift, allowing the Little One to cross.
• Engage with the little Saurian.
• Converse with Bona.
• Endure another cutscene.

Burning Firestone Location #2

The second Burning Firestone awaits on the northeastern isle. Here's how to collect it:

• Adjust the mechanism on the right floating isle.
• Adjust the mechanism on the left floating isle.
• Proceed east over the newly extended bridge.
• Elevate the lift.
• Follow the Little One to the location of the second Burning Firestone.
• Along the way, collect the Genshin Impact Common chest.
• Activate the mechanism to the right of the Firestone location.
• Ascend the newly spawned platforms to the upper floor.
• Overcome the enemy guarding the area.
• Claim the Exquisite chest atop the tower.
• Trigger the mechanism behind the chest to unlock a gate.
• Descend to where the little Saurian is located.
• Unlock the door.
• Prompt the Little One with “Let’s return to the altar!”
• Make your way back to the Altar of Primal of Flame.

Burning Firestone Location #3

For the third Burning Firestone in Tonatiuh, follow these steps:

• Manipulate the right floating isle mechanism.
• Manipulate the northern floating isle mechanism.
• Traverse the bridge to reach the northern isle's lower level.
• Follow the Little One.
• Observe as the Secret Source Sentinel moves the third Burning Stone to the southwestern Isle.
• Head towards the northwestern edge.
• Transform into a Qucusaurus.
• Fly towards the Pyroculus in Genshin Impact.
• Activate the mechanism within the tower.
• Transform back into a Qucusaurus.
• Ascend to the newly unlocked door.
• Use the elevator to return to the upper floor.
• Interact with the little Saurian.
• Follow it.
• Activate the Lift.
• Proceed to the Altar of Primal of Flame.

Burning Firestone Location #4

The final Burning Firestone is situated on the upper level of the northwestern isle. To collect it, do the following:

• Cross the northwestern bridge.
• Request Bona to tilt the bridge upward.
• Leap and glide to the northern isle's upper level.
• Lower the Lift.
• Accompany the Little One.
• Suggest “Let’s return to the altar!”
• Defeat the enemy that appears with a well-constructed team in Genshin Impact.
• Prompt the Saurian to return to the Altar.
• Collect the Precious chest.
• Head back to the Altar of Primal of Flame.

After collecting all four Burning Firestones and presenting them at the Altar of Primal of Flame, you will complete The Flowing Primal Flame Quest in Genshin Impact. A cutscene will then showcase the transformation of the Jade of Return into a Golden Entreaty.

However, the journey is not over yet, as the Dragon of the City of Flowing Ash will disrupt your progress. Follow the Taunted One to the Nursery of Nightmares island to conclude The Other Side of the Sky Quest in Genshin Impact and earn 50 Primogems.