So not speaking gameplay wise rather lore wise. I know that gameplay wise there could be a number of reasons why it's not possible but lorewise it is not really clear: Why don't Void Elf warlocks take their demon pets with them when they use their racial ability "Spatial Rift" to transport themselves a large distance away? What is holding them back from forcing their demons into the Spatial Rift and take that Void portal to their destination?