The Final War「最終戦争 Saishū Sensō」 is the 315th chapter of the manga, Nanatsu no Taizai.
Meliodas continues fighting the Demon King. Meliodas states that he will save Zeldris and kill his father. The Demon King tries to take Elizabeth hostage, but she demonstrates her true power. Meanwhile, the other Sins start fighting the Indura. Merlin gives Ban his Sacred Treasure, Courechouse, at last.
Q341: Hachimitsu Majutsu-san (From Ooita Prefecture): There is something that Ban is not good at?
Nakaba: Taking orders from others.