Since they have no name at all, we have to come up with a name that people will be able to easily identify them. So far I have mostly seen people referring them to as rift pieces. But I don't think this accurately describes them. If I were to suggest a name, I would put forth Blackrock Pillar. It is black like blackrock and a pillar. Other names could be Rift Guardian Stand or Black Stone Pillar. What do you think?