Grysilis Derro

"Everyone dies someday. Wouldn't dying while contributing to the foundations of magic be much more meaningful?"

- Grysilis to Eleonore in "Spirited Away"

Grysilis Derro (ギリシリス・デッロ) is one of the Four Evil Kings, known as the Scarlet Stele King (緋碑王).

Appearance
Grysilis wears luxurious robes and a large hat. His face is completely smooth and featureless, while his body is made of a gel-like substance. It was impossible to tell he was a man from his appearance alone.

Personality
Grysilis takes great pride in his magic research and thinks highly of his prowess in magic. He goes to great lengths to research magic and is willing to sacrifice people and use them as guinea pigs in the name of research. He believes that everyone will die someday, so their death should contribute to the advancement of magic. In combat, he is the type of person to lure an opponent into a trap and cast the first spell, rather than challenging them directly.

History
During the Mythical Age, Grysilis became prominent as one of the most powerful demons of the era, gaining renown as one of the Four Evil Kings, the strongest king-class demons of the era. He battled for control over Dilhade and to assert himself as the ruler of the demon realm, as he battled other demons for that right. Eventually, he crossed paths with the Demon King Anos, who battled him and defeated him. Grysilis became jealous of Anos due to the latter possessing far more magic power then himself, due to his source's limitation, as he tried to steal his source in order to increase his own power, but failed.

Following the Hero Kanon's plan, Anos' loyal subjects and even the powerful demons who didn't get along with him moved away from Dilhade. Grysilis and the other Evil Kings ended up at the Spirit School, where he could further his magical research.

Great Spirit Arc
When Anos travels to the Spirit School to find his old subordinates, he finds the Four Evil Kings instead. Grysilis goads him into attacking first and breaking the school's rules, but Anos doesn't fall for it, so the Evil King takes a seat and waits for class to begin. When class is over, Anos makes a bet with him. If his group passes the test and earns the right to take the spirit trial, Grysilis would have to reveal his superior's identity. The Scarlet Stele King accepts on the condition Anos wagers his source.

During the test, Grysilis tampers with the tests of Anos' subordinates, so the Demon King attempts to check their tests. However, Grysilis summons his scarlet steles to boost Ennunien's Magic Eyes, preventing Anos from taking a look, as it would be considered cheating. But unbeknownst to him, Anos summons Delsgade and uses Venuzdonoa to destroy reason, passing all of his subordinates. As promised, Grysilis reveals that his superior is the Spirit King, confirming Anos' suspicions, as Grysilis was able to tamper with the tests without Ennunien's knowledge.

Abilities

 * Immense Magic Power: As one of the Four Evil Kings, Grysilis is considered one of the most powerful demons of the Mythical Age, as he possesses an extraordinary amount of magic power. However, because his source reached the limit of its potential to grow, his magic power is lesser in comparison to other extremely powerful Mythical Age demons such as his fellow Evil Kings and especially the Demon King Anos, which he greatly resented and tried to find a way to overcome this weakness.
 * Gelatinous Constitution: Grysilis magically altered his body to allow smoother passage of magic from his source. By circulating magic particles throughout the gel, Grysilis increases the efficiency of his magic and improves his spellcasting. His body glows with black light when preparing for combat.
 * Nigh-Immortality: Grysilis researched Hero Kanon's source magic and split his own source into seven quasi-sources, allowing him to use Agronemt when one of them is destroyed. As long as Grysilis has magic power he can continuously resurrect himself from virtually any attack. However, splitting his source made him weaker overall.

Anos Voldigoad
Grysilis greatly despises Anos, as he holds so much power and yet contributes nothing to the development of spells. The sight of his face makes him sick.

Zaburo Gaez
His second-in-command. Like him, Zaburo prioritizes research and is not above using people as test subjects.