Naruto Shippuden Episode 26 -

Despite his massive army, the small organic core in his chest remains his only human part and his greatest vulnerability.

Sakura and Chiyo are operating under a strict three-minute time limit before the poison antidote wears off. Naruto Shippuden Episode 26

He reveals that he has turned his own body into a puppet, leaving only a small "core" of living flesh as his weak point. Despite his massive army, the small organic core

Sasori counters by summoning 100 puppets simultaneously, a feat that allowed him to conquer an entire nation. Despite his massive army