There were always all sorts of rumors regarding special Blades that existed out in the world, the “cores” of which were always highly valued, but that was usually what they were; rumors. One of the biggest was of the Aegis, a legendary Blade, was one of those, and even then people barely talked about it. That didn’t stop people from trying to claim it as their own, though.
Hidden down on a sunken ship in the ocean, plenty of scavengers tried to brave the depths in order to get near it, but few had even managed to get inside and claim anything of their own, much less find what was truly hidden on there. It’d take some serious effort to find it, and a truly determined person...