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Very rarily you could come across a biome called 'Blood ocean'. There could be mobs like Sharks and Sea serpents living there, they could drop very useful items for potions and maybe more. The sharks would spawn in packs of 1-3 and would naturally be very aggresive towards players and other mobs, i imagine that they could oneshot players with no armor. If you brew a potion with shark fins you could get a speed boost underwater, it could be very useful for raiding Ocean Monuments. If the Sea serpent(s) bite you, you will get poisoned, adding to the challenge of getting shark fins. There would be very few fish spawning in this biome because of the presence of Sharks and snakes.