A Nautilus is a neutral mob that can be tamed, saddled, and ridden as an underwater mount that can dash and protects the rider from drowning. With no rider, it uses its dash to hunt pufferfish and to briefly retaliate if attacked. It can also be equipped with nautilus armor... Nautilus, a big guy hidden in a shell. He's a cool guy, a great ride and mount, reaches high speeds in the water, and offers water-resistant breath. This guy is the real deal.

Level: Easy-Medium

Time to make: 2 hours

More about Nautilus: https://minecraft.wiki/w/Nautilus