Badberry

Up to ten berries (apple sized) appear on the ground and are infused with magic for the duration. A creature can use its action to throw a berry at an opponent to have them consume it, it is a ranged improvised attack and the target gets partial cover. 

Eating a berry does damage for 1 hit point, and the berry deals one level of exhaustion. Once the second effect is applied, the creature is immune to further exhaustion levels taken this way. 

The berries lose their potency if they have not been consumed within 24 hours of the casting of this spell.