Death Lightning Storm

You summon a storm of Death Lightning that you can place in locations you choose within range. The area of the storm consists of up to five 5-foot cubes, which you can arrange as you wish. 

Each creature in the area must make a Dexterity saving throw. It takes 4d6 lightning and 4d6 necrotic damage and is afflicted with 1d4 points of Death Blight on a failed save, or half as much damage and no points of Death Blight on a successful one. A creature in the area of more than one lightning strike is only affected once.

And for the spell's duration, clouds of Death Blighting mist linger in the storm's area. When a creature enters a cloud for the first time on a turn or ends it's turn there, it must make a Constitution saving throw or take 3d8 necrotic damage and 1d4 points of Death Blight on a failure, or half as much damage and no Death Blight on a success. A creature that fails it's Constitution saving throw by 5 or more takes an additional 1d4 points of Death Blight.

At Higher Levels: When you cast this spell using a spell slot of 7th level or higher, the amount of lightning strikes you create increases by two for each slot level above 6th.

Condition: Death Blight

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A creature has number of hitpoints only effective against Death Blight equal to it's Constitution score (called Death Blight Resistance). You can never have more Death Blight Resistance than your Constitution core. Once a creature has taken an amount of Death Blight points equal to it's Death Blight Resistance, it suffers 6 points of exhaustion, dying instantly as black brambles grow through it's body. A creature's Death Blight Resistance resets when it takes a long rest. Effects that remove a level of exhaustion restore 5 Death Blight Resistance per exhaustion level removed.

Creatures immune to exhaustion are immune to Death Blight.