Thrombosis

You cause a blood clot to form in the leg of an enemy, causing them to take 2d12 damage and fall prone for 3 rounds. At the start of an affected creature's turn they may roll a CON save. On a success they are able to stand using half their movement as normal, on a fail they remain prone but can perform any actions they would otherwise be able to from a prone position.

At Higher Levels: You may increase the number of targets by one for each level this spell is cast above 3rd.