The Seven Deadly Sins: Four Knights of the Apocalypse 3 (manga)

After defeating the Holy Knight Talisker and joining up with Nasiens the herbalist, Percival and company head to the city of Sistana to arrange transportation to Liones. However, not all is well in the city of Sistana. A Holy Knight is searching for a fragment of the “Coffin of Eternal Darkness,” telling the townsfolk that it will protect them from the danger of the Four Knights. However, a young lady with a strange power knows he has other intentions. When Percival arrives, he discovers that he has a personal stake in stopping this evil plan. But with such a powerful opponent, he may not survive the attempt…