The reason for this was lurking within the Komi Sea, the body of water that surrounded the islands. It wasn't as deep underwater so if one was close enough they could vaguely see a pair of glowing blue eyes rapidly moving underwater.
The deeper one went into the Komi region the more murky the water became due to the equatorial type of climate it experienced in the majority of its parts.
The serpent had made it's way into one such region in pursuit of Lady Rose's scouter underwater. Lady Rose had to make the device perform random turns and twists, sometimes even reducing it's fluctuations just to not get caught by the beast.
'Atleast we know not to fight that thing on water.' Aron who was roughly two kilometers away trying to keep up via land thought with a bit of concern on his face.
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