Can Heartless demons go to Earth?
A Heartless demon, having never been to Earth before, can only go there via a Tether (or if summoned by a sorcerer). If he doesn’t have a vessel or other “anchor” to hold him there, he will soon take damage or get sucked back to a Hellish Heart, if he has one. Shedim might be able to last longer, but demonic Seneschals and Princes frown severely on such unauthorized jaunts. For that matter, this applies to most angels, too.