Well, bloodstones are star stones, but you only unlock things in your homestead with them when you actually use them. So if you're carrying some around then just use them (even if just to heal nothing) and you'll unlock stuff.

Anyway, the hatch is right here: http://steamcommunity.com/sharedfiles/filedetails/?id=283134613

Though you might already have entered it, since it can be accessed through a portal here as well: http://steamcommunity.com/sharedfiles/filedetails/?id=283134764