Creeping Fog of Rot

You conjure a rolling black and grey fog of decay and plague from your hands that spills out in front of you draining the life of everything it touches, except for caster. A creature must succeed a CON save throw or take 8d6 necrotic damage and have their total maximum health reduced by half the amount of damage, on a success they take half damage and suffer no health reduction. If a creature starts or ends its turn in the fog it must make a save or take 8d6 necrotic damage and have their maximum health reduced by the total amount of damage suffered, on a success they take half damage and suffer no health reduction. You may control the path of the fog and its shape and create safe spaces inside it for the duration.

Does not affect constructs or undead.

For every slot above 3rd level add 1d6 necrotic damage.