A Sharp Incline In a Core

What is the sensation building within? Rhythmic in flows and structurally tidal in circumference. Ever ebb the waves. Ever moving. Ceaseless bursts of loops of many hue. Often found through natural waters. In wildlife and breaths of elementals. Breathing new life to the core. Ignition can begin through strings held above. Which can alight the passage to the abyss. And the abyss is the only part existing under a humanoid shell. Swirling. Swimming. Shaping.