There should be a new boss in the game called the sea serpent basically it spawns in the deep ocean and looks like a blue ender dragon but without wings, legs and just basically really long and bigger.
It roams the deep ocean so it isn’t confined to a single area which adds a level of surprise when encountering the sea serpent because unlike the other bosses you either go hunting for the sea serpent or the sea serpent finds you.
Its attacks consists of charging the player or firing a long needle like projectile which travels fast through water.
The charge attack deals 7 hearts of damage while the projectile attack deals 6 hearts of damage.
The Sea Serpent has 250 health and slowly heals itself over time.
The sea serpent travels very fast through water even faster than the max speed of a boat. So if you happen to cross paths with the sea serpent while on the boat, you will still be prone to attack.
On death it drops a lot of experience orbs and sea serpent scales which can be used to craft a new set of armour which allows you to travel fast through water and mine blocks quicker under water. Likewise with the ender dragon it will drop an egg which can be picked up and placed as a trophy. The egg can’t be hatched.
It will benefit the trident too since it will be the most effective weapon in combating the sea serpent considering its effectiveness underwater.
This will make the oceans a little bit more dangerous since the only real dangers consist of the drowned or drowning, but having a chance to encounter an aquatic boss while venturing too deep will be just awesome.
The elder guardian is more of a mini boss in sense and is basically confined to the ocean monument. The sea serpent on the other hand is more of a “boss” than the elder guardian since it has a lot more health and deals more attack damage. Who knows, maybe it could have a cave it could sleep in during the day and roam the ocean at night?