Chilled Spine

A surge of numbing cold flows from your hand into a creature you try to touch. Make a melee spell attack against the target. On a hit, the target takes 1d8 cold damage, and its movement speed is reduced to 0 until the start of its next turn as frost locks its body in place.

Cantrip Upgrade.
The spell’s damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).