Blizzard has so far only revealed a few details, but we do know that Dastardly Duos will be a six-week event in which players take on two (or more) 'animatronic' versions of past bosses at a time, gaining power-ups and pushing high scores to earn a variety of cosmetics, toys, and even some dungeon items based on the bosses encountered.
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Although the event isn't yet available for testing, we've datamined the ten Dastardly Duos bosses available for players to take on in Patch 11.1.5!