Insects

“So, a stalemate.” Itachi looked up at Sugaru. “Then there’s only one way
to resolve this.” His sharingan glittered.
“THAT SORT OF THING HAS NO EFFECT ON ME.”
“Not on you.” Itachi concentrated his chakra, and boosted his sharingan to
the Mangekyo sharingan. He was conscious of the eyes of the insects in
Sugaru’s body, too many to count.
He felt a dull pain in his right eye. It was because he had been overusing
the sharingan ever since that night.
“You said that you’re always watching me. But you’re only one person.
You eat and sleep. So who’s watching me, then?”

“NO NEED TO SPEAK IN SUCH A ROUNDABOUT MANNER ... OH ... ”
“It seems you’ve noticed.”
Something seemed to be wrong with Sugaru, floating in space. It looked
like he was desperately fighting something, his body jerking and twitching.
“Did you think I hadn’t noticed the insects watching over me?”
“IMPOSSIBLE ... THE MANGEKYO SHARINGAN ON MY KOCHU INSECTS ... ”

“By sharing your chakra, you assimilate what the insects have seen into
your own experience. It’s a more effective method than Shadow Clones.”
The sound of wings disappeared from within Sugaru. At the same time, his
body, suddenly gaining gravity, was sucked down to the surface of the earth.
Unable to control his body, Sugaru plunged into the ground headfirst,
incapable of even landing.
“Ngh. Unh unh unh.” Sugaru’s injured vocal cords emitted a real groan.

Book of Dark Night Chapter 6 Part 7