Blood Magik

Blood Magik is a form of dark magic and a concept introduced in the Mortal Kombat X: Comic Series, where it functions as a major plot element.

Origin
Blood Magik originates from the Kamidogu in the new timeline, with the power stemming from the daggers having taste the blood of the One Being. Each dagger has tasted the One Being's blood, and as such, each has the ability to tap into Blood Magik.

Use
Blood Magik acts as a power enhancer, and can increase the strength and speed of the one who invokes it, as well as enhance any natural abilities they may possess as well. To invoke Blood Magik, the user must be in possession of at least one of the Kamidogu and cut themselves with the dagger, offering it their blood in a ritual know as the Blood Code. Depending on how much Blood Magik is invoked, the user may even gain enhanced regeneration, allowing them to heal from wounds even capable of killing them.

Effects of the power enhancement vary, but examples include the ability to fire streams of blood red magic as seen with both Fox and Reiko, and in the case of Sub-Zero, he was able to freeze an entire city solid with a single dagger in his possession. When Reiko invoked Blood Magik using only two daggers, he gained enough power to defeat a sun empowered Kotal Kahn, destroy D'Vorah's body with his bare hands, and fight Kotal, Ermac, and Mileena all at the same time. Raiden was also able to use Blood Magik to temporarily glimpse into the future after losing the ability.

Drawbacks
Blood Magik has several serious drawbacks, the first being that once the magic is used up in the wielder's blood, the user is left severely weakened and in an exhausted state that can last for days. The second is that if too much Blood Magik is used, it has the chance of swallowing the user's soul. Though not normally a standard drawback, due to the machinations of the cleric of chaos, Havik, users are susceptible to possession by him, subverting their will to his and leaving them under his control.

Mortal Kombat X
Though not named, Kotal Kahn invokes Blood Magik while in his Blood God Variation.