Ruin

Ruin (ルイン) is a Holy Knight belonging to the infamous Weird Fangs stationed at Baste Dungeon; he aided in the capture of the Deadly Sin, Ban.

Appearance
Nothing of Ruin's facial appearance is known. He wears a suit of armor, his helmet looks like a human face with white eyes and long hair with 22 holes on both sides of the helmet, he has black shoulder plates that curves inward, and a flower design on his breast plate.

5 years ago
Five years before the beginning of the series, Ruin and the three other members of the Weird Fangs confronted Ban of the Seven Deadly Sins. The resulting battle ended in Ban's capture and imprisonment in Baste Dungeon, where Ruin remained as one of the dungeon's four guardians.

Forest of White Dreams Arc
The guards that are guarding Ban mention that he along with the Weird Fangs are at the Baste Dungeon.

Baste Dungeon
Ruin is at the Baste Dungeon when Friesia finds Diane. He asks Friesia where he is going to which Friesia responds by saying he is going to make the first strike. Later after Golgius returns from his mission, Ruin meets up with Golgius along with Friesia.