At last, he reached his destination.
It was a vast cavern, and at its center floated an-egg.
No, it was not an egg. It was an oval object, its surface covered in bark-like patterns, with a faint light pulsing inside like a heartbeat.
The object was enormous, fully three stories tall. It floated silently at the center of the cavern, above churning, searing lava.
"Mother... left behind... the last..."
Black Zetsu extended a tendril. The instant it touched the object, a powerful repulsive force flung it back.
But he did not give up. Instead, he extended more tendrils, each wrapping around the object's surface as he poured his will and chakra into it.
A thousand years. He had waited a thousand years for this moment.
Before Kaguya was sealed, she had not only created him but also left this deep within the earth's veins.
This was neither a weapon nor an armament, but an "embryo"-a tool the Ōtsutsuki Clan used to colonize new planets.
Under normal circumstances, an Ōtsutsuki would plant a God Tree on the target planet, then leave behind an embryo like this.
The embryo would absorb energy from the earth's veins and slowly grow, eventually hatching into a new Ōtsutsuki individual.
That individual would become the God Tree's guardian and receive the next group of Ōtsutsuki when they arrived.
But Kaguya had defected. Rather than leaving the embryo as prescribed, she had sealed this dormant embryo deep within the earth's veins as a contingency in case she failed.
And now, Black Zetsu intended to activate it.
No, not activate it. "Possess" it.
He had no physical body and could not fight directly. But if he could control this embryo and make it hatch, he could acquire an Ōtsutsuki-level body.
Then neither Uchiha Ryūha, nor the Pure Soul