The Seven Deadly Sins - Season 4 Episode 8 -

Meliodas, Van, and Wild finally confront the Demon King in purgatory. To escape from this purgatory, you must defeat the Demon King and go through the "doorway to this world." Meliodas and others are forced to struggle by the demon king who has a powerful power that "when you attack, you are deprived of magical power." Even after 60 years have passed since the start of the battle, we still cannot find a clue to victory. However, in the battle, Van learns how to "give" magical power to others. In the wake of that change, Meliodas comes up with a secret plan to defeat the Demon King.