Wave of Lathargy

Release a wave of sickening green energy in a 30-foot cone in front of you. Each creature in the cone must make a Constitution saving throw. On a failed save, a creature is Knocked Prone, then suffers 2 levels of Exhaustion, cannot take Reactions, and can make only one attack each turn for the spell's duration. On a successful save a creature suffers no ill effects.

Exhaustion levels inflicted by this spell are removed when the spell ends.

At Higher Levels. When cast using a higher level spell slot, this spell inflicts 1 additional level of Exhaustion for every two slot levels above 3.