Essentially all modern day magic is done by pulling out the essence that is stored within the blood. Using this essence a minuscule amount of magic can be performed. This technique has been known for many centuries or perhaps even millennia but was largely deemed useless for the better part of history as Divine magic could outclass it completely. A special technique of using the magic from bloodurgy know as Ŝanĝi Lokon allows the magic to be many times more powerful.
The usage of bloodurgy has its cost. As the essence from blood is extracted it causes the blood to rot. Doing this too much will cause the blood rot to overwhelm to users body and cause sickness in other parts of their body, eventually leading to death if the rot passes the tipping point of no return. Some extreme users of bloodurgy will perform blood and liver transplants to maintain their spell casting capabilities.