Organization similar to Brotherhood of Steel, or The Secret Police, The Chandrian from the Kingkiller Chronicles. Whispered of, old, organization that still exists, but mostly as a story to inspire or scare young children. Founded by the Arcane Ascendants to be body guards for them, they became zealous enforcers of their will not long after.
Taught protective spells to better serve their mage-lords. And anti-magic abilities to take on their mage-lords rivals.