Ignisefer

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Mother Muspelheim, the Will of the Realm of Muspelheim, who had recently awakened with the death of the Savage Sun Flare Demonic Venerable. The reason why she woke up just now was because this ancient venerable had refined the entire continent, including her will, and had made them all part of his Domain and Power. Once he died by the hands of Surtr, a new and stronger Venerable, the entire continent was freed from his control and so, the Will was finally awakened from her long slumber.

She could be considered a Spirit, or perhaps even a Soul of the Continent, which was once a planet-sized Realm of its own, hanging from the Yggdrasil tree as a fruit-like growth. Of immense size and filled with essence, she spread this energy everywhere and is part of the reason why the entire Continent is so "alive" despite it all being a burning hellscape.