Tangleroot

You cause roots to burst from the ground around your foe's feet. Choose a creature of large size or smaller that you can see within range and that is on the ground. The target must succeed a Strength saving throw or be knocked prone and have its speed reduced to 0 until the end of its next turn as the roots wrap around the target and pin it to the ground.

Cantrip Upgrade. The number of creatures you can target increases as you reach certain levels; up to two targets at level 5, three targets at level 11, and four targets at level 17.