Unfailing Endurance

This spell enhances the natural hardiness and stamina of the affected creatures by rendering them virtually immune to fatigue or exhaustion. While under the spell's influence, the subjects may engage in up to 12 hours of hard labor per day with no fatigue (or up to 16 hours with moderate fatigue), and gain a +4 bonus to Strength or Constitution checks. In addition, the subjects gains advantage to saving throws against spells or magical effects that cause weakness, fatigue, or enfeeblement.