Tutorial/All-purifying Sacred Flame...

Smaller flames split from the Stadium of the Sacred Flame, intended for the Turnfire Night ritual conducted by the Scions of the Canopy. They contain a blessed power that dispels the darkness.
Interact with lit braziers to obtain the Sacred Flame's protection. Then collect and throw Flamegranates to cause explosions that will scatter the Abyss's power.

While under the protection of the Sacred Flame, you can approach an unlit brazier and ignite it.