(Either they die miserably or they kill whatever is in their way!)
The basic Nebulon of Death is:
Support Refit with AST, LTT, and SFO at 62pts.
The fleet needs a minimum of 4 of these, but 5 also works.
Leia is the commander, and she rides on Jaina's Light with TRC if you use 5 Nebulons, or on an MC30 with whatever toys you like and has a Slicer Tools Transport as an assistant.
Weaknesses: bombers, although the LTTs help a bit at killing these; and other MSU fleets.
Strengths: simply deletes slower, big ships. 2 turns of shooting to kill an ISD, 3 to kill an SSD or Starhawk.
They take a bit of practice to get them into position - they all need to be shooting the same target, the same turns.
And great fun.