The Quadken

The Quadken is the boss of the Atlantic Waters. "A new four-tentacled behemoth has arrived in the depths of The Atlantic Waters in the form of the squishy and monstrous Quadken! The Mother of all Duopi, The Quadken will do anything to protect her young from surface invaders, and with four powerful tentacles to shield her, daring adventurers will have to outmaneuver and outsmart this angry mother if they wish to venture past her sticky domain."

- Version 0.6.3 Update Notes

Description
Duopuses are cephalopods that only possess 2 tentacles. They live are social animals and they have a queen, the Quadken, which is the only female that is capable of reproducing. Thus, the Quadken is the matriarch of all Duopuses, and dutifully guards her batches of Duopus Eggs that lie scattered in her huge, open lair. She is a gigantic cephalopod with 4 tentacles, and due to her size she cannot move. She seems to protect its young by keeping them inside its mouth, similarly to the Darwin's frog. It is unknown what makes a female duopus become the queen.

Behavior
The Quadken will use its tentacles to protect its head and to attack the submarine if it gets too close, dealing heavy damage and launching the vessel away, possibly dealing further damage if it hits a wall in high speed. When the submarine is beyond its range, it will release Baby Duopuses (unless there are more than 2 alive or not inside the Submarine) to defend itself.

Trivia

 * The name "Quadken" is a portmanteau of "Kraken", the legendary sea monster and "quad", which means four, referencing how it only possesses 4 tentacles
 * The Quadken is one of three bosses with a unique theme.