I was hoping taking nova while holding this would have some effect (as per Stories book thing). I was dissapointed. For the diffuculty getting this and the mysteries surrounding other museum stuff I feel there has to be more to this sword.
Things tried: combinations of melee, etheric and fire, using sword techs, taking a large dose of eclipse, wearing a buried crown (king related story), fighting while holding stories at an exhibition or the horse skull, fighting the rider, resting, wandering around in the moor painting, reading about peat and moors (apparently they were once a popular artistic landscape),