Seven Deadly Sins, The Revival of the Ten Commandments

Merlin

Merlin is a member of the Seven Deadly Sins, the Boar Sin of Gluttony. She is the daughter of the greatest sorcerer, Belialuin. She was blessed by both the Supreme Deity and the Demon King. Merlin has the ability to use her magic power called Infinity, which she used to get eternal life. Merlin's age is about 3000 years old but her appearance looked like a 30-year-old woman. She was miraculously born with infinite magic. 

During the battle of the Seven Deadly Sins and the Ten Commandments, Merlin easily defeated Grayroad of the Ten Commandments. After the Seven Deadly Sins were framed, Merlin headed to Camelot. She then met a boy named Arthur, later on, she became the teacher and friend of Arthur Pendragon the king of Camelot.  She was also the teacher of Vivian. 

Every day she researches different types of experiment and dreams to know everything. Before she was framed she held the Diamond Rank. 

She can use many types of spell, her sacred treasure is the Morning Star Aldan which she used when Galand turned her to stone.

Merlin decided to negotiate with the gods of both clans, the Supreme Deity and the Demon King said she would follow the one who gave her the best blessing. The Demon King gave her all the knowledge of the dark secret arts of Demon Realm and made her immune to the brainwashing and possession abilities of the goddesses. The Supreme Deity gave her protection against dark curses and Commandments. Merlin somehow managed to deceive both gods to renege on them by accepting both blessings. Furious, the two gods unleashed their anger against Belialuin, cursing it with fog and death for a thousand days and destroying it with fire and lightning. Merlin was able to escape unharmed, becoming the only survivor of Belialuin.