Endsong

Barely hanging onto life, you perform The Endsong. When in effect, Endsong covers the area in a haze of red light and emits a haunting melody that yearns to bring all souls together into one by destroying their physical forms. Constructs and undead aren’t affected. Every minute, starting at the 1st minute, all living creatures must make a Wisdom Saving Throw of 18 as the song releases a wave of magical energy. A creature takes 8d8 necrotic damage on a failed save, or half damage on a successful one. Any creatures killed during Endsong can not be resurrected. The Endsong can not be interrupted. When the spell concludes, you must make a single death saving throw to determine whether or not the effort of performing Endsong kills you.