Miyu's Severed Head

Her abandoned skull smiles at you from the deep

Captain, don't make me get back on that ship. I know you didn't see what me n' the rest of the crew did, but you gotta believe us -- it was huge, writhing, horrifing... and it smiled at us.

— First Mate in Fear

As far as most ocean biologists, and even most sailors, know, The Teneran Deep is an area entirely void of life. That section of ocean's propensity to open wide and suck down whatever used to be floating above has scared away anything that wishes to remain living. That is, almost anything, if a few sailors' tales are to be believed.
Some who have skirted the edges of the Deep, or even dared cross it, have come away from the experience with harrowing tales of a nightmarish beast -- a massive Rendling, comprised almost entirely of the remains of Miyu's long-ago severed head.

Eye Witness Reports

No single sailor has managed to lay eyes on the beast for long enough to verify its existance, or even give a firm description of it. Accounts vary from person to person, some swearing the head was nearly 100m across, while others reporting that it came in at a size roughly half that.

Did... you... see... its teeth...?

— Fearful confirmation

All witness do agree that the beast takes the form of a head, however. Common across all sightings is the fact that it appears to be a massive, dessicated skull, with tentacles writhing in place of hair.

While reports vary in the number of them visible, most seem to indicate that the teeth are numerous, and take on the appearance of long and thin curved needles. Some have said that the teeth were gnashing together, almost in a mocking grin, as the head writhed through the sea.

That's it, I'm buying land and startin a farm. Won't find me out on the water ever again, no way, nu uh.

— A Sailor's conviction

Rendlings

Beasts born of blood and nightmares; when Ichor gets in or on animals, they mutate into horrible monsters. Even worse are Rendlings born of old, discarded parts of God-husks -- known as Deific Rendlings, these beasts are mythical, incredibly dangerous, and nigh impossible to kill.

A proper investigation

Enough eye-witness reports have come in that the Legion has opened up an official investigation into whether or not Miyu's Head actually is a Deific Rendling prowling The Teneran Deep. The process has been moving slow so far, and the Legion is yet to release any information confirming nor denying the existance of the beast.
Still, the Legion's silence is enough proof for many undecided people to begin believing in the monster's presence.

If the Legion ain't talking, it means they're hiding somethin, or they're up to no good. Mark my words, that beast is real.

— A Sailor's warning

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