How about a spell that prevents exhaustion?
Casting Time: 1 action
Components: V, S
Duration: 8 hours
You touch a creature and fill them with boundless energy.
The first time the target would gain a level of exhaustion as a result of a failed save, the subject gains a reroll on the saving throw, and the spell ends.
If the spell is still in effect when the target is subjected to an effect that would cause a level of exhaustion instantly, that effect is instead negated against the target, and the spell ends.