Moulting Warlocks, like Great Sin Scholars, were both gifts left behind by the Angels.
The fallen Angels had brought people entirely new powers. By developing these powers further, people discovered professions that had always existed in this world, but had remained hidden because no one had found them.
"To change your class to Moulting Warlock, you must learn 'moulting.'"
"Moulting?"
David hesitated when he heard that frightening word. "Does that mean peeling off your own skin and growing it back?"
"...Not exactly."
Iver could not help laughing. "That's the 'Moulting Ritual.' Just as a caterpillar turns into a cocoon and then transforms into a butterfly, you cast off your old body and gain a more beautiful one.
"This is the power possessed by the Butterfly Angel of the Path of Beauty... She can enlighten ugly things and have them reshape their shells. There's a ritual that borrows the Butterfly Angel's power, allowing people to change their appearance."
In player terms, it was called "washing your face"—in other words, recreating your appearance.
Race, gender, age, build, appearance... Apart from the "background" chosen when creating a character, everything else could be changed.
It was also the ritual players came into contact with most often.
David asked eagerly, "So should I perform the Moulting Ritual?"
"No," Iver denied. "You should train your body.
"Moulting Warlocks sound like professions such as 'mage,' 'Law Mage,' and 'Demon Scholar,' but they're actually close-combat professions."
"...Huh? Why?"
David was confused. "Aren't they 'warlocks'?"
"Because Moulting Warlocks sign contracts with the Ring Angel, to be precise, they're 'contract warlocks.'"
Iver explained.
The "Ring Angel" was the code name of the Son of the Serpent Father, Ouroboros, and also the source of the ritual power of the "Ouroboros Ring."
In the game's lore, this profession was born after the