Earthshaker is a 4 star Claymore obtained from crafting in Genshin Impact.
Oath of the Verdant Path
When a party member triggers a Pyro-related reaction, the equipping character’s Elemental Skill DMG is increased by 16%/20%/24%/28%/32% for 8s. This effect can be triggered even when the triggering party member is not on the field.