Board Thread:General Discussion/@comment-33263812-20190915165412/@comment-29325824-20190922201450

Ulitma werewolf wrote: How did Muramasa brainwash all the zanpakto

You know, you could just look at Muramasa's page to find out, or continue watching... But to answer your question, that's his signature Zanpakuto power: to control other Zanpakuto; just as much as Hyorinmaru's power is to control ice and Ryujin Jakka's is to control fire.