A member of the decentralized criminal organization that has footprints all over the continent of Teyvat and even deep within unknown domains: the Treasure Hoarders.
This one was originally a miner — one who, even with the allowance they were provided with after the closure of the Chasm Mines, ended up with the Treasure Hoarders for various reasons.
When not smashing boulders to look for precious ores, Crusher could clobber skulls like plums with his massive hammer.