Board Thread:Fun and Games (Random Discussion)/@comment-24719940-20140322081647/@comment-25032153-20140817180444

given that Meliodas had the last key to the seal on him at all time and even in the past was shown to have the sword there but didnt use it and they all have in some part to do with the demon clan like ban and king as the demon destroyed the forest when king was not their and killed Elaine and she save ban giving him immortality from the water. Melin was the one that sealed them as she is shown to the most powerful magic user and her ability counters every spell. Daine was the one that hide the Seal part throughout the world with garth hide the last sliver of the seal. and the last sin is also linked some way to the demons and have a type of immortality also.