Gennul

Gennul, the Wolf of Hiding (隠狼ジェンヌル) is the Spirit of hiding.

Appearance
Gennul has the appearance of a large wolf with wings. He can also clad his body in lightning for additional protection.

History
Gennul was born from the legends and rumors about spiriting away others. Students who fail their tests at the Spirit School are spirited away by him to take supplementary lessons. By the time Anos arrived in Aharthern, Gennul had already spirited away his subordinates and those of the Scarlet Stele King, Netherworld King, and Cursed King. Under the Spirit King's orders, he also spirited away the Cursed King himself despite never failing a test.

Great Spirit Arc
When the students of the spirit class attempt the Spirit Trial, Gennul serves as one of the trials they must overcome before they can meet with the Spirit King. The Wolf of Hiding immediately passes Lay and Misa, but stops Anos and Aeges. Gennul challenges the two to catch him, passing the first one to do so, but unbeknownst to him, the two decide to work together to defeat him.

No matter how fast Gennul ran, Aeges' spear never left his side and eventually cuts him into two. However, this body was only an illusion, and Gennul summons hundreds of wolf-like bodies from the thunderclouds. Anos uses wind magic to disperse the clouds, but the Wolf of Hiding simply causes a fire in the Great Tree and creates bodies from the flames. When the flames are extinguished, he creates wolves from sunlight, and when that is stopped as well, Gennul makes them from the wind.

Because Rina was spirited away around that time, Anos gets an idea. When the sunlight wolves appeared, she reflexively closed her eyes due to the brightness. Anos hypothesizes that Gennul is a spirit that couldn't be seen because he only appears when people have their eyes closed. He closes his eyes and then uses the all-reaching spell Ygg Neas to capture the Wolf of Hiding and pass his trial. In that tiny moment, Aeges was able to pierce into Gennul's inner dimension and leave a marker, allowing him to teleport inside later and rescue those who were spirited away.

Abilities

 * Supernatural Concealment: Gennul's wolf body is only an illusion, as his real body can't be seen, and there are no records of it. He only appears before those who have their eyes closed. It goes further than simple invisibility, as he doesn't exist when they have their eyes open.
 * Hiding: As the spirit of hiding, Gennul can make others disappear. Rumors state that those spirited away are either hidden at the world's edge or inside Gennul's body after being eaten, but he can bring them back when he needs to. In truth, his body acts as some kind of magic dimension where he can hide the people he spirits away.
 * Supernatural Speed: Gennul is able to move at the speed of lightning.

Spirit King
The Hidden Wolf is the Spirit King's watchdog. If he gives the order, then Gennul will return those it took away.