1 action
Touch
V, S, M (diamond dust worth at least 100 gp, which the spell consumes)
Instantaneous
You imbue a creature you touch with positive energy to undo a debilitating effect. You can reduce the target’s exhaustion level by one, or end one of the following effects on the target: One effect that charmed or petrified the target One curse, including the target’s attunement to a cursed magic item Any reduction to one of the target’s ability scores One effect reducing the target’s hit point maximum
Source: Player's Handbook