Dimensional Barriers could provide the possibility of protecting the Lydus from being distrupted, but like all barriers, there should be a way to bypass or break it. FTL scenarios are possible, such as the usage of the Alcubierre Drives. Basically, the higher the dimensional plane, the harder to break. The Warp Drive scenario could be possible, but there are more dimensions in the universe. 4D universes have a nonlinear time, while 6D universes are free.