Prismarina Octopus

This mob would be found in the coral reefs, perhaps defending a new structure that can be found there. These octopuses would have the same behavior as the guardians, in terms of behavior and objectives. They could change shape and color almost without limit, and their attacks would be based on this ability, since depending on the player's proximity to this octopus it would transform into one or another creature.
For example, if the player is very close to the octopus, it will take a shape similar to that of an inflated puffer fish, while if the player is far away, the octopus will take a shape similar to the guardian to use its beam. It could also come out of the water, and if it is attacking a player it will take on the appearance of a spider or creeper as well depending on the distance it is from the player. If the octopuses are not attacking a target, they will have a coral appearance or their normal appearance. They would release the same as the guardian when eliminated but they could also release thread, powder or algae.