Damocles

Arc of Damocles is a Caster Magic utilized by various mages.

Description
In order to utilize this magic, a mage has to first make a contract with the Absolute Emperor, a Familiar Spirit said to be second in terms of power only to the Familiar Spirit King. Afterwards, said mage is able to draw upon and utilize the power of the Absolute Emperor, which varies in its incarnation depending on the caster in question. When a mage has gained a high enough degree of mastery over this magic, they become capable of fully channeling the power of the Absolute Emperor through the manifestation of their King's Blade, which varies in appearance based on the caster.

Weaknesses
This magic is not without its drawbacks. First, in order to even persuade the Absolute Emperor into forming a contract, a mage must possess a massive wealth of magical energy. Second, this magic is incredibly difficult to control, and also runs the risk of backfiring on the caster. Third, in using their 'King's Blade'' in battle, the caster puts his- or herself in a great deal of danger, as their Blade not only reflects their current status in battle, but it also possesses enough destructive power to potentially kill a mage if their magic backfires while their Blade is active.