Apokalypsis

Creates a beam of pure necrotic energy. All creatures in a straight line before you must make a CON saving throw or take necrotic damage equal to 4d4 plus your spellcasting modifier; Still takes half damage on a successful save. Additionally, so long as concentration is maintained, and you take no action, bonus action or reactions and don't move or turn, this spell's effects retrigger at the end of every turn for the next 10 turns.