Gloomhaven

Monster consuming element as group

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When a monster's initiative comes up and the monsters consume or infuse an element as part of their ability card, do they each consume/infuse an element as they take their individual turns or do they consume/infuse the element as a group?

They consume/infuse the element as a group when the 1st monster takes their turn, with all the currently revealed monsters of that type gaining any benefit. However, if new monsters of that type are later revealed, they would need to consume the element again to gain the benefit (assuming it is available).