Elmide

Not to be confused by Eldmed Ditigeon, one of the Four Evil Kings.

Elmide (エルミデ), the Hermit (隠者), was the Sovereign of the Silver Water World Listeria.

History
The Hermit Elmide was the Sovereign of Listeria, a powerful world that had reached the 99th layer at the height of its prosperity. He was the researcher and creator of the Karakuri Gods, mighty artificial soldiers that could dive into the abyss and steal the Fire Dew from the Abyssal World, closing the power gap between the two worlds.

For unknown purposes, Elmide pit the Disaster Abyss World Evezeino against the Holy Sword World Hayfolia. He implanted a Karakuri God at the bottom of the Disaster Abyss of Craving and hid it from Evezeino's Chief God, Yzak. Because the artificial god stirred up the cravings in the abyss, the Phantom Beasts became feral and attacked Hayfolia's Hunting Nobles. However, the Holy King Ordov Heinriel realized that unknown powers were pushing them to fight, so he made an agreement with Yzak. When Yzak went into slumber, Evezeino followed after, temporality stopping the conflict.

14,000 years ago, as Listeria approached the abyss, Elmide went mad and killed Ottlulu, his own Chief God. After their world's destruction, he committed suicide. However, this was only a ruse, as he still lives. Around the same time, Elmide killed Lebrahard's subordinates during his ascension to Holy King, and made him believe he was responsible for it. Since Hayfolia would fall into chaos if it were known that the Holy King killed his own men, Lebrahard hid this fact and continued governing with a guilty conscience. As a result, he lost the ability to wield the legendary holy sword Evansmana. After compromising Hayfolia's new ruler and clouding his judgment, Elmide was able to reignite the conflict between Hayfolia and Evezeino.

Holy Sword World Arc
When Yzak awakened, Evezeino set a collision course toward Hayfolia in order to devour it. Anos Voldigoad, who wished to protect Ordov's dream of peace, went into the Disaster Abyss of Craving to find what was influencing it. He discovers the Karakuri God with the help of Hayfolia's Chief God, Eife, but Elmide personally takes control of the machine and absorbs her into its body. Due to Anos' nature as a Lion of Destruction, Elmide can counter his abilities with Eife's blessings, so Anos switches to the Two Laws Sword and bisects the Karakuri God into two. However, it regenerates and then surrounds itself with a powerful Vortex.

Because only a Vortex can interfere with another one, Anos' Deepened Raviaz Gilg Gaverizd is ineffective. As a result, Anos uses his Magic Eyes of Chaotic Destruction, which destroys all logic and order, to stop it. Since they also negate the Karakuri God's regeneration, Anos is able to rescue Eife from within. But because the Eyes also suppress Eife's order, rendering Hayfolia powerless against Evezeino's predation, Elmide makes Anos choose between sacrificing the Holy Sword World or allowing him to regenerate.

Anos chooses neither and turns the mechanical god into ashes with his sight. Afterward, Anos carves out the entirety of the Disaster Abyss of Craving from Evezeino, stopping the Disaster Abyss World. Elmide dares Anos to find him, as Anos cuts down the remains of the artificial god for good.

Anos Voldigoad/"Demon King"
Elmide seems to recognize Anos, or at least a past life of his, as a Demon King of the Silver Sea, stating that he has since fallen and become weak. He also claims that said Demon King was responsible for Listeria's destruction and has been searching for Elmide for a long time without success.

Trivia

 * According to Ottlulu, he is a hermit due to his decision to live in seclusion from Pablohetara, as he felt shallow and middle worlds should be able to make their own decisions without being influenced by Listeria.