Hobble 2014

Evocation cantrip

Casting time: 1 bonus action
Range: 30 feet
Components: V, S, M (a broken rabbit’s foot)
Duration: instantaneous
Save: Dexterity

You create an ethereal trap in the space of a creature you can see within range. The target must succeed on a Dexterity saving throw or its speed is halved until the end of its next turn.

Source: Deep Magic for 5th Edition (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details