Cecani’s Wave of Corpses

You summon a writhing wave of zombies that runs through a 30 feet wide and 90 feet long, up to 15 feet tall area Each creature in that area must make a Dexterity saving throw. On a failed save, a creature takes 6d8 necrotic damage and is knocked prone. On a successful save, a creature takes half as much damage and isn’t knocked prone. The wave of zombies then crashes onto the ground, leaving behind 1d8 (+ your spellcasting Modifier ) Zombies. These Zombies remain and will move towards and attempt to attack the nearest non-undead, non-construct creature.

If you cast this spell over 8 hours, the range and size of the wave are increased to 120 feet wide, 360 feet long, and 60 feet tall.