Hearth Fire

The Hearth Fire is the flame that has burned for decades to keep the villagers of the Great Lake warm, which also allows one to seek answers from Spirits. The fire holds great importance to the villagers, symbolizing hope and warding off darkness. Thus, the majority of them will do anything to protect it.

History
When the Winters in the Never-Realm began growing colder, the villagers of the Great Lake lit the Fire to keep their tribe alive. To ensure the fire would not go out, as it had become far too cold to light another, the people fed the flame wood every morning and every night for decades.

The Never-Realm
The Ninja are saved from a pack of Wolves and brought back to the Great Lake, Sorla allows them to come in for warmth from the Fire. To help them find Zane, she uses incense to ask the Spirits of the Earth and Spirits of the Lake to show them Zane's fate. The Fire reveals Zane to be within the Castle of Ice, leading Sorla and the Ninja to believe he is the Ice Emperor's prisoner.

Fire Maker
General Vex and his Blizzard Samurai march towards the Great Lake to punish the Ninja for challenging the Emperor and the villagers for aiding them. The village elders quickly convene to determine the best course of action to ensure their people's safety. While the majority refused to leave the fire due to its importance, some believed there was no other option. Sorla informs the Ninja about the Fire's significance and after learning it would be difficult to transport, the heroes promise to help defend it. Kai is saddened by the fact that he'd be able to help had Aspheera not stolen his Elemental Powers, though is assured by Sorla his powers will return.

During the battle against the Ice Samurai, the Ninja gain the upper hand. In a last attempt to finish them off, Vex puts out the Hearth Fire, taking away the last source of warmth on the ice. As the villagers begin to feel the effects of the extreme cold, a guilt-ridden Kai manages to light a new fire, being dubbed "Fire Maker" by the villagers.

Trivia

 * The Hearth Fire's ability to display visions from Spirits is similar to the Spirit Smoke formerly relied upon by Master Wu to see future events during Season 1.

Season 11: Secrets of the Forbidden Spinjitzu

 * 114. "The Never-Realm"
 * 115. "Fire Maker"