The snake is one of the ready-made images available within the Imitating Drawing. The user depicts a snake on a scroll with ink saturated with chakra. When the brush leaves the paper and the user forms the Seal of Confrontation, the drawing comes off the scroll, grows to real size, and begins to obey the creator's will.
In battle, such a snake is convenient for capturing: its body stretches out and coils around the target, acting like a rope. Since the creature consists of ink, it is able to slip even into a narrow crack without unnecessary noise. This makes the snake suitable not only for restraining, but also for hidden surprise attacks. Like other drawings of this technique, the snake is short-lived: usually a single hit is enough for it to disperse.