S04E138: Twin Princess

Sil is revealed to be one of the Six Funeral Wreaths. Bel, Fran, Olgelt, and Sil release their box weapons for battle. Sil's box weapon is revealed to be a Storm Bats with the ability to fire invisible sonar waves enchanted with storm flames; The storm flames when in contact with something causes an explosion. Bel and Fran are defeated. Olgelt sends his Rain Elephant and destroys the castle the Varia invaded. In the remains of the castle, an unharmed Xanxus on his throne is seen drinking wine.