Raised in a city inhabited by wizards, a group of a non-identifiable clan that remained neutral during the Goddess vs. Demon clash, Merlin was born with the mystical power of Infinity. You guess right, the ability to hold unlimited power, even time. Because of this ability she was approached by both the supreme beings of the Goddess Clan and the Demon Clan to help in the war to overcome their opposites. In exchange they will give her magical knowledge of their respective Clans. Merlin made the deal with both beings, received her gifts and joined neither side. The supreme beings wanted revenge so they destroyed her home town in hopes that she would perish with it. Merlin escaped but got sentenced as the Boar Sin of Gluttony to represent her excessive compulsion, disregard for others and the damage it caused.
We’ve seen how she built enchanted eyeglasses for Escanor and a suit for Gowther to nullify their power for their sake and others. She created a magical pill that temporarily makes Diane human-size to make her feel welcome among the group and spend time with her husband. She’s also mentored others for their better outcome and played a vital role in recruiting members for the team. Her Deadly Sin has helped her and her team multiple times as she has a lot of answers to many situations or has contingency plans for the moments she isn’t confident in.
