Medium

The Medium (依り代, Yorishiro) is a crystallized body of an immense quantity of Black Rukh and Magoi. It is the trigger that brings Il Illa to the world. The Medium is a living creature.

Magnostadt Arc
After taking Titus Alexius' Magoi, as well as others, the Medium appears and connects itself with a creature up in the sky.

The Medium creates Black Djinn and attacks Magnostadt. The Magicians try to defend, as well as Scheherazade, who orders it to give back her son. It breaks her Borg and pierces her through her arm, but Alibaba Saluja stops it. Then, Hakuei Ren uses wind to drive the Black Djinn out of the city. She grabs multiple Black Djinn at once and once again pushes them out. Kougyoku Ren and Kouha Ren aim at one Black Djinn. Kougyoku creates a hole in it and Kouha slices it. Kouen Ren puts his sword in one of his opponents and with quick movement destroys it. The Medium creates more and more Black Djinn.

Kougyoku and Kouha continue their teamwork to destroy Black Djinn one after another. Koumei Ren summons Big Dipper Transfer Circle. He draws constellations and transfers half of the leg of Black Djinn which appears in another Magic Circle and hits the another Black Djinn. He performs the same attack on a large group of Black Djinn at once. Hakuei creates a path for Alibaba by pushing out all of Black Djinn standing in his way. Alibaba quickly gets closer to the opponent and tries to slash it, but even with Amol Saiqa, is unable to do so, as the Medium formed a Defensive Wall.

Kouen goes into a group of Black Djinn, attacks one of them and instantly destroys it. After covering his Metal Vessel in flames, he jumps from one Black Djinn to another and as soon as he touches them with his sword, it burns and blows them away. Just then, multiple Black Djinn catch him and cover him in their hands, but Kouen casually uses his sword again, destroying six of them at once. He goes around and destroys another Black Djinn. Being surrounded by them, he goes towards the volcano he created and replenishes his Magoi. Kouen continues defeating Black Djinn that stands in his way. Enraged, he screams that once he gets rid of them, he will obtain everything he desires. He adds that fools like them who can't even talk will die and wants them to hurry up and let him talk with Magi.

The Black Djinn surround Kouen. Then, he and Alibaba use their Extreme Magic on it: Kouen's Astor Inqerad in a shape of the dragon he summoned, surrounds the Medium from all sides and with white flames, destroys all the Black Djinn outside the Defensive Wall in an instant. Alibaba summons a large sword and person covered in flames, Amol Al-Bador Saiqa, and aims the Defensive Wall. He is able to open some cracks in the Defensive Wall. He then uses his move again and creates a big explosion. With this, he opens more cracks in it, and although isn't able to destroy it completely, the two of them managed to break the pillar that connected the Medium with the thing in the clouds.

When a Black Djinn tries to go outside of the Medium's Defensive Wall, it gets incinerated in Astaroth's white flames. When Alibaba and Kouen try to replenish their Magoi in the volcano, multiple hands from the Medium reach the volcano first and take fire's Magoi away, turning the fire into a black substance. The Medium then starts reabsorbing the Black Djinn. It then changes his shape from the sphere to the huge, slim doll looking like a skeleton. It absorbs Astaroth's flames with its hands and does the same for the ground, trees and birds, changing everything to black and thus, killing it.

The Medium's head turns into several tens of thousands hands. With one of them, it reconnects itself with the thing in the clouds. Alibaba tries to stop it and quickly charges on the enemy. However, a Defensive Wall is created around one of hands which stops his Amol Saiqa. Alibaba starts slashing through it multiple times, but soon gets attacked by himself. The Medium tries to catch him, but he successfully runs away and dodges it for some time. However, the palm of the Medium's hand touches Alibaba's arm and strips off his Djinn Equip there. It's then able to hit Alibaba with a great strength, so Alibaba hits the ground and gets pushed by it for some meters, destroying ground. Kouen comes from behind and with his sword, touches his opponent and creates an explosion. The Medium defends with Defensive Walls created around every of its hands. It then grabs the whole body of Kouen. He releases his dragon which cuts off the hand of the rest of the arm and falls down. He ends up being hurt all over his body, with the skin of his face completely teared off. The same happens to Alibaba's arm.

Kougyoku charges on the opponent with Vainel Arros, but her attack is stopped by the Defensive Wall. Knowing that continuing this way is useless, Kougyoku summons multiple water spears, Vainel Al-Salos. After declaring that she will spear it full of holes, with a great speed, she sends them on her enemy. The Medium defends with the Defensive Walls created all over the place, but some of them touch its body. After some time, most of it gets speared with Kougyoku's attack. The Princess uses Vainel Al-Salos ones again, spearing the next parts of the Medium's body. Aladdin summons three Ugos and wants to end everything in one go with Har-Har Infigar. However, the Medium steals the Rukh from the sand. Kouen orders to not move recklessly and commands Koumei to direct the rest and their attacks.

Hakuei summons her Extreme Magic, Pa'ir Al-Hazard, and catches it in the tornado. Then, Kouha comes at it with Lelazzo Madraga and makes a hole in it. He sends it right to the ocean where Kougyoku is waiting and preparing Vainel Ganezza, which she makes looking like a spear. She leaves even bigger hole in it. After that, Aladdin uses Har-Har Infigar on it.

The Medium defends from everyone's attack, including Aladdin's Har-Har Infigar, Hakuei's tornadoes and Kougyoku's spears. Kouha notes that they already used their Extreme Magic, but whatever they do, their Magoi is not enough. Aladdin says that they have to stop it before it regains its Magoi. He uses Har-Har Infigar, Alibaba - Amol Dherrsaiqa, and others attack as well. With Big Dipper Transfer Circle, Koumei transfers everyone's attacks to one big frame and directs it at the Medium, making it sustain serious damage. However, it falls to the sea and starts stealing Rukh from it and regenerates. While doing it, it becomes bigger.

Abilities
Defensive Wall
 * The Medium is able to create the Defensive Wall around itself. It is said to be several tens of times harder than the Borg of Magi.
 * After changing its form to that of big, slim doll, the palm of its hands creates the Defensive Wall.

Black Djinn creation and absorption
 * The Medium is able to create and reabsorb the Black Djinn.

Stealing Magoi
 * With the palm of its hands, the Medium can take the Magoi of all living creatures away, leading to their death. It can make itself stronger and bigger this way as well.

Trivia

 * "Yorishiro", the way the name of the "Medium" is written, is in terminology an object capable of attracting spirits called kami (which are elements in nature, animals, creationary forces in the universe, as well as spirits of the revered deceased), thus giving them a physical space to occupy during religious ceremonies. Yorishiro are used during ceremonies to call the kami for worship.