Teleport

“Right. Call him.” He appeared to be talking with someone via chakra.
“It’s been a while, hm? There’s just someone I want you to meet. Right. Oh,
go through Pain, and send your chakra here. Align your chakra with Pain.”
Madara looked at Itachi once more. “He’s here.”
A rainbow-colored wave rose up in the nothingness next to the stump
Madara was sitting on. It shimmered and shook fiercely for a while, but then
gradually took on the shape of a human, until finally becoming the clear
figure of a man. A man Itachi had seen before.
“Oh my, it’s been a while, hm, Itachi?” the rainbow-colored vision uttered
in a creepy voice that sent a chill up his spine.
“You ... ” Itachi murmured.
Madara raised his voice. “One of the legendary Sannin ... Orochimaru.”
“Strange for you to be so sarcastic about it.” The corners of the rainbow
phantom’s mouth curled up slightly.

Madara ignored him, and stood up. “Welcome to Akatsuki.”
Itachi took the proffered right hand. It was frightfully cold, a hand in which
no trace of blood could be felt, so cold he almost wondered if the leather
glove that covered it was frozen.
“All right, then. I’ll take my leave. We’ll meet again, Itachi.” The phantom
of Orochimaru disappeared into thin air.

Itachi Shinden Book of Dark Night Chapter 6