Weird Fangs

The are an order within the Holy Knights assigned to Baste Dungeon as prison wardens. Five years before the beginning of the series they fought and captured the Deadly Sin, Ban. The group consists of four members, each with distinct abilities.

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

Forest of White Dreams Arc
The Weird Fangs are being mentioned by the guards near Ban's cell when they expressed confidence that no one can possibly try to break the Fox's Sin of Greed out.

Trivia
Weird Fangs