Devouring Danzo took less than a few breaths, but the backlash came later than it ever had before.
By the time Shinichi withdrew his hand, Danzo's corpse had completely lost its warmth. The Third Hokage was saying something behind him about arrangements for dissolving Root, while ANBU poured out of the woods and began clearing the scene. Everything was still proceeding normally—until he tried to take his first step. He lifted his foot, and his leg moved forward, but the instant it touched the ground, his knee buckled. His whole body swayed to one side. The Third Hokage caught him by the shoulder, quick-eyed and quick-handed. Shinichi waved to show he was fine, but after lowering his hand, the color began draining from his lips.
It was not pain, but another, stranger sensation. It was like someone was using a dull blade to cut through a layer of fibers that belonged to no part of his body, moving agonizingly slowly. The dizziness did not come from his head. It came from somewhere deeper, as if his very consciousness were leaking. The pain was blocked behind the surface of his senses, with only a dull throbbing faintly seeping out from the depths of his body. Then the system prompt lit up—not in its usual cool, steady synthetic voice, but as a dense string of warning text flooding directly into the depths of his mind.
"Warning: Izanagi backlash. When Danzo died, the Izanagi formula stored within the remaining Sharingan in his right arm entered the host's mental world alongside memory fragments and is attempting to forcibly activate within the host. Current route: soul-mental network. Spread range: core personality foundation."
The words were still flashing in the corner of his vision when Shinichi felt as though his mind had been struck by a