PHB, page 246

Greater Restoration

5-level Abjuration

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[/li
• One effect reducing the target's hit point maximum