Cuffs Of Cold

You attempt to latch handcuffs made of ice to a creature you can see. 

The target must make a Dexterity Saving throw or have one pair of limbs be negated. For instance, if the caster were to aim at the target’s legs, they would be knocked prone, and have their movement speed reduced to 0 feet. Or if the arms were targeted, the target would not be able to do any action that involves their arms.
The target takes 1d4 cold damage each turn, and can end it with a successful Constitution Saving throw. The Caster may choose not to take this effect if they so choose.