You open a sixfold tear in reality, leading to the absolute stillness of the void inbetween worlds. All creature within a 30ft cone originating from you must make a constitution saving throw, or take a level of exhaustion.   Any creature failing its saving throw must make another saving throw, gaining another level of exhaustion on a failure, and so on.   Once a creature succeeds on its save, it is immune to this spell for 24 hours.