Why it evolved

The immense hydrostatic pressure of the deep ocean drives the evolution of a denser, more robust mantle tissue and a hydrostatic skeleton to prevent collapse. This adaptation comes at the cost of reduced metabolic efficiency and a significantly weakened psionic field, making it vulnerable to the larger, energy-rich siphonophores like the Abyssal Abundance Floater, and necessitating a trade-off in speed and active psionic capabilities. The JoJoLands world's unique pressure-based power system means this creature must sacrifice its resonance ability to survive the physical crushing forces.