As it was Vaccus, both the Narrikians and the Fioans would have found themselves unable to move or have been moving very slowly. This was due to the fact ALL of Vaccus was black holes, every known type out there. Grey holes, quasistars, black stars, and several others. This being a source of great density and in affect very strong gravity, caused a natural time-dilation throughout the entirety of the cosmic void. The only reason the Felicity hadn't been affected was due to the fact they had a stasis field. Now that the stasis field was destroyed with much of the other tech, the field overpowered the ship its self too, as well as attacking invaders.
As for invaders by magic, a quick beam from the pulsar at the center of the galaxy to Nil and reflecting it back to the area would make short work of any magic used.