Krampus

Krampus is a Hardmode, post-Plantera enemy that appears during the Frost Moon event. Its first appearance in the event is on Wave 8. Defeating a Krampus does not reward any points during the Frost Moon, as of version ; before that version, it awarded 10 points.

Trivia

 * is known in Alpine folklore as the evil version of Santa Claus (or a companion of Saint Nicholas), punishing or capturing children who misbehave during the Christmas season.