As an action, you warp the locomotive limbs of creatures which are typically its legs though it may be its wings or other limbs. Choose lengthen or shorten as the spell’s effect.

Lengthen. A creature that you can touch or see within 10 meters has its locomotive limbs grow incredibly long and springy as its speed increases by 2 meters and it has advantage on Athletics checks to jump for the duration.

Shorten. Up to two creatures that you can touch or see within 10 meters and within 5 meters of each other must make a Fortitude saving throw.

On a failure, one or more of the creature’s limbs grows longer or shrinks shorter than its other limbs as its speed decreases by 2 meters and it has disadvantage on Athletics checks to jump for the duration.

A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Augment

You can target one additional creature with lengthen or two additional creatures with shorten for each additional mana expended. The creatures must be within 5 meters of each other when you target them. You can choose to mix and match the effects by lengthening one creature and shortening two creatures for example.