Ten-Step Destruction

Take a step while counting to ten, one count per step, each step releases a burst of destructive energy that ripples outwards from you. Each target you choose within 60 feet of you must succeed on a Constitution saving throw to take half damage, this save is only made the first time they take damage from this spell and only effects the damage from that casting instance of the spell. Each step deals increasing amounts of damage and is harder to withstand. The first step deals 1D10 Force damage and every step after deals an additional 1D10 damage, 2D10 then 3D10 and so on to a max of 10D10 on the Tenth Step. Each time a target takes damage from the Steps it must make a Constitution saving throw or suffer one level of exhaustion. On steps Three and above targets have Disadvantage on the save, on Steps Six and above 1D6 is subtracted from the roll as well, and on Steps Nine and Ten the DC is 20 and 21 respectively unless your DC is already higher, in which case the DC on Step Nine is increased by 1 and 1 again for Step Ten. To take a Step with this spell is a deliberate action. When all steps are spent or concentration is broken the spell ends.

You can attempt to use this spell again without a spell slot but you must succeed a DC15 Constitution saving throw and take 12D6 Necrotic damage that cannot be negated or reduced in any way. On a failed save you take 12D6 Necrotic damage, that cannot be reduced or negated, and gain a level of exhaustion. You cannot use this spell again until you complete a long rest. Succeeding allows you to make the attempt again with a DC20 Constitution save, if that attempt is failed you gain two levels of exhaustion as well as the damage, and you cannot use the spell again until you complete two long rests as the sheer destructive force of the spell takes a toll on your body.

If this spell is attempted by a spell scroll then the caster must succeed the first recast save (DC15), effects of the save still apply.