Immobilization Magic

Immobilization Magic (不動化魔法, Fudōka Mahō) is a Caster Magic and one of the more powerful forms of the Black Arts, as it involves the usage of "time"; this makes it a form of Subspecies Magic, using Time Magic as the basis of its creation. It was created some time ago by an unknown Dark Mage in his attempt to control the concept in-question. The knowledge was passed down for many generations, thus its existence is known by various Dark Mages and Demons alike.

It's also one of the few magics that's on-par with Curses, being able to affect other races with sheer ease. Despite its incredulous power, it's mastered by a few because of the traits required to properly wield it; this makes it one of the most difficult magical forms that a person could learn.

Trivia

 * This is basically an expansion on the canon counterpart used by Zeref, but for the author's personal benefits.
 * In a sense, this is basically the high-level version Temporary Paralysis Jutsu from the anime/manga series, Naruto. In this case, it involves the usage of time to freeze the target.
 * According to Aionius, this magic is a "cheap knock-off" of the Chrono Saturnalia — forged in an attempt to replicate its effects without his permission; thus, he has a keen hatred of this magic and those who use it.