Excalibur powers vs Riita

They throwing good hands, Arthur’s bobbing and weaving hitting him with quick cuts and heavy blows, and Riitta is giving pretty good, but he notices Arthur’s not getting tired or bleeding. And Arthur smirks at him, says “Magic scabbard. For my magic sword!” and proceeds to slice Riitta in half with Excalibur through Riitta’s heavy ass armor.
21st Century Guide to Mythology: Arthurian Myths Retold page 33