Old turn of the century mineshafts?
Emptied underground river?
What's the soultaker made out of.
Because it looks like it's designed so that when they have to make a shitty plastic toy version to give away with happy meals, its going to be piss easy.
Is it supposed to be jade, or copper, which has turned green like the statue of liberty?
And why do the characters on the sword look like Celtic runes more so than Japanese symbols?