Two Blue Vortex. Kurama used Baryon Mode to defeat Isshiki, surpassing his power. Baryon Mode led to Kurama's death, but he respawned in Himawari. Himawari's unique bond with Kurama could allow her to ...
Seeking out new Tailed Beasts or becoming a Jinchuriki could ... which was when he opened Baryon Mode to defeat Isshiki. However, this power came at a huge price, as Kurama ended up dying.