A New Aquatic Boss

Minecraft has few bosses (The Ender Dragon, The Wither, and maybe if you count The Elder Guardian. But in this they could add an aquatic biome called a decayed sea biome in which may have a flooded portal. You can dig up the portal and the put it on land. You would then have a rare aquatic fish (it lives in the decayed sea) that would have a chance of dropping an item. You can than use the item to light up the portal. There would be a large aquatic boss In the portal. It would have a large mouth that would swallow the fish in it and would spray poison effect out of it’s gills that would linger in the water. When it gets killed it would drop fins that you could put in your off hand to swim faster in water. This would put more use to the Trident and I think we have waited long enough for another boss.