C233 Endurance! Heart of Resentment

"Yin Release! Isn't this the fabled ninjutsu of the Rikudou Sennin's brother?"

Tsunade staggered backward in disbelief, his eyes wide with shock at the sight before him.

The black substance defied ordinary comprehension, proving even more vexing than Itachi's Amaterasu. It spread endlessly, obliterating everything it touched.

It was as if a virus had taken hold