Seven Deadly Sins & Arthur Pendragon vs. Cath Palug

Seven Deadly Sins & Arthur Pendragon vs. Cath Palug is a battle between the Seven Deadly Sins and Arthur Pendragon against Cath Palug. It is also the final battle in the series.

Prologue
After sending the remaining Sins, Elizabeth, and Hawk away, Merlin takes Arthur into one of the numerous towers he unconsciously created using the power of Chaos and he awakens to see Merlin in ectasy over a fraction of Chaos' powers and explains why he isn't angry with her, only for the tower to shake and for a familiar voice to call out to himl, revealing to be Cath Palug in his true form.

Arthur is shocked, believing he had destroyed the tyrant beast but Merlin says she will protect him from the cat monster and goes out to do battle with it, but is fighting a losing battle due to Cath still possessing a fragment of Chaos he took from Arthur, who comes out himself in order to save Merlin from the monster.

Arthur attempts to slice Cath into pieces using Excalibur but Cath simply regenerates and mocks Arthur for thinking he can kill him so easily, but Arthur claims he will do whatever it takes to protect Camelot from him, only for Cath to taunt him and tell him how Camelot was destroyed in the battle against the Sins and the Demon King while posesssing Meliodas.

Distraught, Arthur initially rejects the thought but using the power of Chaos to see for himself, becomes devastated upon seeing his kingdom completely demolished and the lives of those in the bunker, who were counting on him, were lost in the war, giving Cath the perfect opportunity to attack him.

Merlin attempts to stop him but is throw aside by the monster who attempts to take her out, only for it's attack to be reflected by Meliodas' Full Counter. Merlin is shocked at their arrival while Meliodas says that she needs to take responsibility for what she has done by protecting Arthur and as her friends, she needs to let them share that responsiblity with her, much to her gratefulness in helping her and Arthur in their time of need.