Your body becomes flexible, able to contort into impossible angles. It moves exactly how you need it, making you perfect.
Your tongue can extend dozens of meters in the blink of an eye, crossing distances to choke opponents or creep your opponents out. Your capabilities with ninjutsu have given you the ability to summon massive walls, able to block significant attacks that can take out even mountains. Multiple walls can be summoned in tandem to protect you.
This all pales to your signature weapon: Kusanagi. A legendary sword you can extend out of your mouth to pierce through nearly any defense. It is unbreakable and can extend and retract. It is flexible as well. You not only possess Kusanagi, but you possess the ability to summon snakes that have Kusanagi inside their own mouths, to swarm an opponent and kill them with the amount of blades.
As an added bonus, you can summon a massive snake named Manda, who is your ally. He is aggressive and rude, but very powerful. While he is powerful enough to be a worthy companion, he is weaker than you.
Your overall talent with ninjutsu increases significantly.