Blood Boil

A thick sanguine mist spreads in a 30-foot-radius sphere centered on a point you choose within range. The mist spreads around corners, and screams the deathly wails of damned souls for the duration, it lasts until the spell ends.

When a creature moves into the spell’s area for the first time on a turn or starts its turn there, that creature must succeed on a Constitution saving throw or take 4d10 fire damage, and it suffers one level of exhaustion and crimson fire causes it to admit a dim light in a 5-foot radius. This light (and the creature's presumed screaming) makes it impossible for the creature to benefit from being invisible. The light and any levels of exhaustion caused by this spell go away when the spell ends.