Crimson Purgatory

when casting the point of contact must be within 150ft of the caster. once cast any entity within a 30ft radius of the point of contact must make a Con saving throw to take half damage. when moving through the spell anything that tries to pass will have half of the original speed. the spell does 8d8 damage to anyone it is cast, anyone who enters it or ends their turn in it. after the initial cast, it will do 6d8 damage and they must make another Con saving throw to take half damage