Blood Wave

A large wave of blood springs out from a point you choose within range. The wave is 10 feet wide, and moves 20 feet in a direction of your choice when you cast the spell. Each creature that the wave enters the space of must make a Dexterity saving throw. On a failure they take 4d4 necrotic damage and are moved back or upwards 25 feet (your choice). On a success they suffer have damage and are moved back or upwards 10 feet (your choice). Undead, plants, and constructs cannot take damage from this spell.