The Drowned King

The Drowned King would be a new Boss for the Overworld and Underwater, because I feel like the Elder Guardian doesn't do the Boss Level justice.

The Drowned King would be summoned with an Armor Stand and Zombie Head on top of it. It will only be summoned if the Armor Stand is Underwater. Once summoned, the Drowned King will make the weather Thunder, and wield 2 tridents for 2 different occasions. One Trident would have Riptide and Impaling, the other would have Channeling, Impaling, and Loyalty. He would have 100 health, and have the ability to summon 3 Drowned with random equipment. Once killed, he will drop a new item, which redirects here.

I think this idea would be a decent addition to Minecraft because it would give players a new incentive which adds to the big incentive that 1.13 gave to be underwater, and it would provide a new, unique challenge.