Genshin Impact 5.0 update has brough the next nation called Natlan, also known as the Pyro nation. It features Pyroculus that you can offer to Statue of the Seven to earn multiple rewards. Apart from this, you can also earn Pyro Sigils that you can get by opening chests or as one of the rewards for offering Statue of the Seven. However, where exactly do you use them in the game and here is your answer.
Where To Use Pyro Sigils In Genshin Impact
You can use Pyro Sigils at Tona's Flame in Natlan in order to level it up and in return, you will receive multiple rewards like Primogems, Acquaint Fates, Crown of Insight, and more.
You can find the location of Tona's Flame marked on the map below and to reach there, you can first teleport to Stadium of the Sacred Flame waypoint.
In order to unlock it, you will simply have to go near it and interact or you will also unlock it while completing the Chapter V: Act I "Flowers Resplendent on the Sun-Scorched Sojourn" Archon quest.
There are a total of 50 levels of Tona's Flame, so you will need a ton of Pyro Sigils to fully upgrade it and claim all the rewards.