Beast Transformation is Orochimaru's experimental cursed seal, differing from the standard ones. Instead of Orochimaru's direct bite, the chosen one receives a snake bite leaving a tattoo with instructions for creating a potion. The potion is made from many exotic ingredients and, after consumption, triggers the first level of transformation. The drinker's physical strength, speed, and chakra reserves sharply increase, muscles grow, and animal features appear on the body - for Mizuki, these are tiger stripes on his arms and face. He easily breaks through the ground, hurls opponents, and moves at such speed that he seems like a blurred spot. However, the seal is unstable: the potion was incomplete, so the effect is temporary and destroys the body's cells.