Seven Sages of Destruction

Introduction
The Seven Sages of Destruction were a group of seven powerful demon mages who served the Demon King until his demise. They seemed to work under the Demon King's confidant, the Omniscient Schlacht. In the past, the Sages were important generals of the Demon King Army, securing key areas of interest in the Northern Countries. In a battle against all of the Sages and Schlacht, Three of the Seven Sages were taken down by the Hero of the South. Two Sages, one of which was the Immortal Bose, were defeated by the Hero Party. After the Demon King was defeated by the Hero Party, the remaining Sages of Destruction either went into hiding or disappeared. Twenty-eight years after Himmel's passing, Aura the Guillotine was defeated by Frieren. The last remaining sage is Macht of El Dorado.

Aura the Guillotine
Aura ascended to her seat among the Seven Sages of Destruction 500 years ago. Her magic is the Scales of Obedience, which weighs the amount of mana of two souls and grants the party with more mana dominion over the other's body. The control of her magic is near absolute with the exceptions of extremely resilient souls. Because of this, Aura decapitates every body she controls, granting her the moniker of "Aura the Guillotine".

Aura managed to survive a battle against the Hero Himmel's Party, going into hiding after the Demon King was defeated. However, when the Hero Himmel died, she resurfaced once again. Aura was later defeated by Frieren.

Immortal Böse
Little is known about Bose other than the fact that he was vanquished by Himmel and his Party. His eradication became one of the adventure tales of the Hero Party.

Bose was seen briefly in the flashback of Chapter 63 along with all the other Sages of Destruction. He wore a helmet and had horns growing to the sides instead of growing upwards like other demons.

Macht of El Dorado
Macht is considered to be the most powerful Sage of Destruction. He uses Di Agölze (Universal Golden Transmutation magic), a powerful curse which cannot be detected, analyzed or dispelled. The gold he creates with his magic is unmalleable and distinct from naturally occurring gold. In addition, he is a powerful physical fighter, who often preferred to fight with a sword. Macht uses the coat he wears on his left shoulder in battle, either transforming it into a large golden sword, or turning it into gold as a shield. He is also proficient at using other types of magic.

Unlike most fellow demons, Macht dislikes conflict, battles and expresses a desire to understand humanity's emotions, despite his repeated failure to attain the latter. He is the last surviving Sage of Destruction. Currently, he is sealed inside the Great Barrier of El Dorado, along with the Fortified City of Weise which he destroyed in an attempt to experience human emotions.

Miraculous Grausam
Other than the brief appearance in Chapter 63, Grausam made an appearance in Chapter 89 in Macht's memories, where his appearance was used to threaten Macht to comply with Schlacht's demand. Not much is known about his magic aside from the fact that he is the worst match for Macht.