Castle Avarius, home to the commander, Ludo.
Castle Avarius is a large fortress owned currently by Ludo. Located in the protected groundlands of Mewni, Castle Avarius once served as the home of Ludo's family before their banishment by the latter, who used it as his own base of operations in the process. The castle also appears in the second Disney Heroes vs. Villains War as one of the minor locations of the series.