Jelly Colony Behemoth (Fun)

Appearance
A five metre tall being, essentially all upper body. With a massive bloated form that is protected by hard crusty plates, it shields whoever is piloting it inside. It has two deep purple tentacles on each side and a light blue translucent dome for a head.

Information
The Jelly Colony Behemoth is an advanced form of a Lesser Jelly Colony created by multiple colony organisms fusing with each other. The fusion needs to be initiated by a biomancer, the resulting creature has high defenses and poisonous attacks but is dumb due to a total lack of braincells and extremely immobile, effectively only able to move wherever the waves carry it. At least the idiocy can be worked against by the biomancer partaking in the (nonpermanent) fusion, making himself the controller over the body.

Reference
Fought in Chapter 412 "VS the technically-not-a-true-jellyfish-but-actually-a-siphonophore"