Dark Storm

A dark storm cloud appears in a cylinder 100' wide and 50' tall centered on the caster.

Each creature in the area is struck by lightning and takes 10d8 lighting damage and 10d8 necrotic damage at the beginning of each of the casters turns for the duration.

Any creature killed by the spell becomes a creature of the same challenge rating chosen by the caster.

The caster can also combine the challenge rating of monsters killed by the storm into a monster with the sum of all the challenge rating of all the monsters chosen.

Any monster killed and not megred becomes a creature of the same chlange rating.

Any creature killed and turned into something else is under the control of the caster.