Blood magic was a dark art that had once flourished across the realms.
Thousands of years ago, it had been a common, if controversial, practice, with users wielding life essence as fuel for their power. But about a millennium ago, the dark elves managed to master the blood magic creating a group of super figures; the Blood Monarch.
These ruthless figures wielded blood magic on a scale so devastating it altered the course of history. Their reign of terror had spurred the Magus Alliance to outlaw blood magic entirely, banning its practices and hunting down practitioners.
Even half-bloods with natural affinities for blood-based abilities, like the bat half-bloods, came under scrutiny, and strictly monitored by the Magus Alliance.