Mass Life Fades (5e Spell)
From D&D Wiki
|Casting time:||1 action|
Target a point within 60 feet. In a 20 foot radius around that, each creature takes 10d6 cold damage and gains 2 levels of exhaustion. On a successful Constitution save, they take half damage and do not become exhausted. The levels of exhaustion from this mystery do not stack with each other, so a creature hit by a second casting would not gain additional levels of exhaustion.
If you have mastery of the Breath of Twilight path, add your charisma modifier to the damage, and the save DC is increased by 1