Exhausted

Up to one target of your choice that you can see within range when you cast this spell must make a Constitution saving throw. Whenever a target fails this saving throw they become effected with one level of exhaustion. On your next turn you may choose to recast spell on the same target to increase the level of exhaustion. Once the spell ends, the target loses one level exhaustion per round. This spell can be stacked up to the maximum level of exhaustion

At Higher Levels. When you cast this spell you increase the spell save DC by +1 per Spell Slot level. For example, if you cast this with a 2nd Level Spell Slot, you add +1 to the Spell Save DC. If cast with a 3rd level Spell Slot, add +2, etc...