Aqua affinity is a unique enchantment in Minecraft that makes it, so players don’t suffer any mining penalties when trying to mine blocks while either floating in or underwater.
Players will experience a slight delay in mining blocks if they don’t have an aqua affinity enchantment. If you have an aqua affinity enchantment item, an armor piece that can be enchanted will allow you to mine faster while floating in the water. Aqua affinity makes it easier to obtain blocks that you can only obtain underwater.
So, if you are interested in this enchantment for whatever reason, the best way to get it would be to make books and then an enchantment table. You will then need to make 15 bookcases and place them around the table with a one-block buffer zone between the 15 bookcases and the table.
When you are done, you will need to use both books and lapis lazuli to make enchanted books until you get the aqua affinity enchantment.
You can also use fishing poles to get an aqua affinity book, but you will need to get both the lure and luck of the sea enchantments on the fishing pole.
It is possible to trade emeralds among villagers, and also loot enchanted books from dungeon boxes to obtain aqua affinity. However, either the fishing rod or the enchanting tables routes are the best methods to get the book.
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