Dark Chakra Mode

Tsuyo, upon gaining the Reibi and sealing it within himself was able to feel a new type of chakra, though it was unlike any he has ever felt. It was known as Dark chakra. It came from the Reibi though only after he made a deal with it did the beast allow him the ability to convert his chakra into such.

Normally, one would be able to draw upon the beast's power similar to a jinchuuriki and his biju but the Reibi would have none of it. So a deal was struck between Tsuyo and the Reibi. So long as Tsuyo gave the beast his chakra, the beast would supply Tsuyo with an equivalent of Dark Chakra. Tsuyo accepted this deal knowing the price behind the exchange.

Tsuyo would have one dimension of chakra which is his own that he uses for ninjutsu, taijutsu, genjutsu etc. Well this mode of sorts adds a different dimension of chakra that simply enhances jutsu when used by him. It also creates a poisonous effect on those not influenced by the Reibi's chakra when absorbed. This simply means that if anyone were to absorb the Dark chakra, they would not be able to mold their own chakra for a short duration, depending on the exposure.

Tsuyo, once he creates a perfectly even balance of dark chakra is able to utilize that chakra in battle. Dark Chakra Mode alone does not in any way shape or form enhance the user physically. It merely enhances a jutsu in a similar form of the cursed seal.

Now, the downside to this is that Tsuyo's body must remain in a state of stasis as it draws the dark chakra from the reibi and then balances it with Tsuyo's own chakra after making the exchange. If a perfect balance is not established by disrupting the body's stasis, the reibi consumes the dark chakra and replaces Tsuyo's exchanged chakra. However, Tsuyo himself would not be able to mold chakra for a short duration of time. During this time, he is also weakened physically, making this technique a gamble to use under the wrong circumstances.