Exhausting Ray

This spell has the Hex tag. You send a ray of exhaustion at a creature, making them feel gradually weaker and weaker. A creature you choose within range must make a Constitution saving throw against your spell save DC as a bonus action on each of its turns for the duration. Constructs and undead automatically succeed. If they fail in the first 5 rounds, they take a cumulative -1 penalty to all Strength and Constitution saving throws per each failure for the next 24 hours. If they fail in the last 5 rounds, the target takes a cumulative 1 level of exhaustion per each failure. If they roll a 1 within the last 5 rounds and have less than 50 current hit points, they automatically die of exhaustion. Any of these effects (except obviously death) can only be removed by Remove Curse or Greater Restoration.