"The Big One"

Summoning
It can be summoned after all 3 mechanical bosses are defeated. In order to summon it you have to craft living flesh by combining rotten chunks and souls of light. Then use it as bait on a high power fishing rod

Fight
Once it emerges from the it chases the player, it can launch bubbles that can stun the player making it harder to stay away. It also shoots tridents that can produce electrical sparks. If it reaches the desert or a dry biome it will despawn.

Stats
Hp: 40000

Damage: 140 (Normal), 200 (Expert)

Defense: 400

Defeat
It drops the Lighting Trident, which shoots electrical sparks. It sometimes also can drop Ocean Chests.