Chakra exhaustion from an S-rank shinobi like Itachi Uchiha from just a few moves? It really didn't make sense. If anything from this place actually did...

He leaned back against the wall, eyes half-lidded, but sharingan still active. It looked as though it was taking an incredible amount of willpower to keep them that way. His breaths were shallow and labored. His haggard body trembled as he clutched his chest. No. This was far more than chakra exhaustion. He was seriously sick.

"A lot... I'm afraid..." He coughed out a few answers. "But I'm... making the best... of the... the time I have left..."