A magus–a creature of pure mana and capable of anything, even the spells adorned by the gods. Necromancy, healing, and even the most devastating of assaults, nothing was beyond them and with a lifespan that neared immortality, there was no one who could stand against them–that is if they weren't hunted before maturation.
Most magus died in the womb because of genetic complications, and those who made it into the world were often hunted by zealots of gods who had no clue why they were ordered to kill these children. All they knew was that their god had decreed it so and thus it shall be. Nothing else mattered, not even the cries of children as they drove a spear through their chests.