Muspel

Muspel (ムスペル) is the Stone, one of the Four Great Spirits. It was said to roam freely within the Sacred Vollachia Empire and had settled itself in the territory of House Abellux until it was partially devoured by Arakiya roughly 7 years before the start of the main story.

According to Vincent Vollachia, Muspel and its mana are currently being used for the Great Disaster by Sphinx to revive undead throughout Vollachia.

Personality
Muspel is thought to have no will, words, or philosophy, and appears to exist solely as a deific being. Records from the Empire state that Muspel moves on a grand scale every 12 years, leading to various earthquakes after its movement.

History
Some time around the events of Vollachia's most recent Imperial Selection Ceremony, Vincent Abellux found a method to trap Muspel within its territory. By using Muspel's power, he was able to repel the attacks against his castle ordered by one of his younger half-sisters, Lamia Godwin. Later on, when Prisca's life was in danger due to Lamia's artillery, Arakiya devoured a small portion of Muspel in order to defend her princess.

Trivia

 * According to Fenne in Re:Zero Forbidden Book and the Mysterious Spirit, Muspel's abode is located in the Gairahal Tropics.