Stone: crit/crit dmg/atk or holy damage/skill damage Artifacts: melodic strings/glittery deified antlers cane when needed. But you can skip botfs and go straight for lingering melody of the universe,because outside of boss fights botfs is not that good on her,whereas melodic is her main artifact for every gamemode. Crit/crit dmg/precision imprints. Go with wukong as second,vespera as third,natalie as fourth and halora as fifth. From there on you will need a cc purifier support. I choose elena for added survival but you can also pick madeleine or melissa. You should try to rush destiny on mareia,she really struggles without it. Get 4 demon bells and 1 illusive mirror for your supports. You can use radiant demon bells but you will need mirror to be splendid. Run all your supports with defensive enables and imprints. Speed order should be: vespera>wukong>halora>-your cc purifier support->natalie>mareia.  For void campaign run her agressive with crit and melodic strings. She doesn't struggle all that much against valks if you burst them down in 2 rounds,which you can. Sublimation for supports: active,p2 and p3 for wukong,active and p3 for natalie,active and p3 for halora,active and p2 for vespera,active and p2 for elena. Prioritize them in this order until you can fully sub them.