Here's how to enable co-op, find all the Mutation Stone locations, and which characters you should use across the Genshin Impact Energy Amplifier event.
source https://www.digitaltrends.com/gaming/genshin-impact-energy-amplifier-event-guide-mutation-stone-locations-co-op/
source https://www.digitaltrends.com/gaming/genshin-impact-energy-amplifier-event-guide-mutation-stone-locations-co-op/
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