"The highest level wizards could even store their souls in hocruxes. This means they would keep their soul in several different items, and hide them. Anyone who wished to kill them should find all horcruxes and destroy them. That could be a really challenging task to accomplish."
"They are called Margueritte The White and Dolores The Firebringer," said Mrs. Adler. "At least, that's what they were known as before they embarked on the journey to Atlantea, decades ago."