Tsue to Tsurugi no Wistoria Season 2 EP14 - The Party from Hell Begins

A horde of monsters from the deepest floors appears, transforming the festive capital into a hellish scene. Sensing that they're the targets, the Magia Vander stay within the tower. The city’s defenses fall before the mage slayer wielding High Dinoboros. Colette and the dwarves join Will, putting up a desperate resistance. The Headless activates a magic circle and a Devander appears before Will!