Lore Bit:
When one strains their essence, either by performing too many feats of power, or by pushing beyond their natural reserves, it can lead to what is known as “essence fever.” The symptoms of which may vary. They may become tired/lethargic, and lose concentration or focus easily, or grow nauseous and dizzy. Some severe cases can even result in small comas. Unlike regular illnesses, essence fever isn’t physical. It is purely a malady of the soul, and cannot be cured through normal medicine. The only cure is by resting and recovering energy. Peculiarly, it may also be treated from simply being around a trusted companion, the essence of said individual easing the strain by naturally sharing small yet steady amounts of energy.