Bakudō # 1: Sai

The practitioner points their index and middle fingers at the intended target(s), causing the target's arms to lock behind their back. The spell is usable on a single target or a significantly large group of people.

The caster can choose up to three targets within range and force them to make a strength saving throw against the casters spell save DC. On a success, nothing happens. On a failure, the target's movement speed is reduced to 0 and they are knocked prone. They may repeat this saving throw at the end of each of their turns, ending this effect early on a success.