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When you kill an enemy in Minecraft Dungeons, there is a high chance that green gems will scatter everywhere. These are emeralds and they act as the game’s currency. So why do you need emeralds?
Well the main reason is to exchange them with the Blacksmith or the Wandering Trader at the camp for a random weapon, random armour piece, or random artefact. Since they are randomised and you’ll have the chance to get unique weapons quickly this way, you’ll want as many emeralds as possible.