Once the Nine-Tails' Jinchūriki absorbed enough Tailed Beast Chakra, they could enter a special mode: Nine-Tails Chakra Mode.
However, entering this mode required enough strength to seize the vast majority of the Nine-Tails' Tailed Beast Chakra and store it in their body. The previous Nine-Tails Jinchuriki, Mito Uzumaki, had been able to enter this state. It greatly enhanced both speed and strength, and also allowed its user to sense goodwill and malice, distinguishing friend from foe.
"Boss, I feel like I can do anything now. This power is incredible. I could fight ten of my old self."
Kushina spoke to Karn with a beaming smile. She had just used her newfound ability to sense him, and the boss held not the slightest malice toward her. Sure enough, that Minato Namikaze had been talking nonsense.
"Well then, Kushina, to help you get used to your abilities as quickly as possible, come spar with me."
Karn spoke to Kushina with a smile as well. In Nine-Tails Chakra Mode, she ought to be a formidable speed-based opponent.
"Sure! Then let's bet a favor. Whoever loses has to do one thing for the winner."
Kushina spoke to Karn with absolute confidence. Even if the boss's abilities were a little extraordinary, she was certain she could win.
"Sure. Let's begin, then. Stupefy!"
Before Karn had even finished speaking, he cast a Stunning Spell at Kushina. However, in this state, both her speed and perception had increased severalfold. The moment his spell shot out, Kushina vanished from the spot.
The next second, Karn instinctively tried to use the Flying Charm to take to the air and fight on the move, but before he could, Kushina sent him flying with a heavy punch.
There was a thud.
Without the Shield Charm on him, Karn would probably have