San'ō (散桜 Cherry Blossoms Scattering?) is the name of the blade that Heather C. Thanatos currently wields. It was achieved honorably after a duel with the former wielder of the blade, Shinji Kazuma, who descended from the Wano Country. It is a Meito of the O Wazamono class, and is currently the substitute for her other blade, Senjugahara until her younger brother, Nick C. Thanatos returns it. Heather likes giving it the nickname Seiken (青剣 Azure Saber?) due to its color.