Using the fragment of Kanna's mirror given to him by Byakuya, Sesshomaru is able to make Tenseiga replicate Tetsusaiga's powers and abilities and challenges Inuyasha to a battle to test his worthiness to wield their father's fang of destruction. Every time the swords cross, Tetsusaiga regains some of its powers and abilities back. Sesshomaru uses Meido Zangetsuha on Inuyasha and throws Tenseiga inside, but Inuyasha cut through his demonic energy to save himself. Naraku tries to control Tenseiga through Kanna's mirror, but Sesshomaru jumps inside Meido Zangetsuha and forces Inuyasha to break Tenseiga. Tetsusaiga's blade becomes black, Inuyasha uses Meido Zangetsuha to exit the Underworld and the broken Tenseiga comes back anew. Now freed from his obsession with Tetsusaiga, Sesshomaru is one step away from obtaining a much more powerful weapon of his own that is not inherited from his father.