Swamp King

The Swamp King is a alligator snapping turtle looking boss mob, you can find them by breaking a chain on a witches hut, this will release the captured Swamp King.

First, it will open it's mouth wide which will push you towards it in the water, it could also do this if you're trying to escape.

It can release poison cloud from it's shell (much like musk turtles)

It can bite you if you get too close.

It can only be at the bottom of the water.

Once killed, it drops: Chains (used to craft chainmail armor) Swamp King's Shell (Used as a shield, but can also release poison cloud) and Algae (I can't think of a use for this, it could be useless like rotten flesh)

I think this would be a great addition to Minecraft!