The Seven Deadly Sins Omnibus 4 (Vol. 10-12) (manga)

While storming the Kingdom, King discovers Diane on the brink of death! Secrets long forgotten rise to the surface as King must come to grips with his painful past. Afterward, Meliodas, and The Seven Deadly Sins find themselves teaming up with King Arthur against the unfathomably powerful Hendrickson in a fight to save Princess Elizabeth! Just when things are at their bleakest, an unexpected hero will step forward to save the world from darkness!