In putting together a list for facing some Necrons tomorrow Night I've found a pretty nasty Deathstar Artillary Unit:
Take Illic
Add:
Rangers upgraded to Pathfinders
Dark Reapers + Exarch w Fastshot
Aegis Defense Line with Either Quad Cannon or Icarus
Join Illic to the Dark Reapers
Stick both Units behind the Aegis, but in distance so that either unit can fire the Gun.
Since Both Units have Stealth + Shrouding you are looking at a 2+ cover save.
Either Unit can fire the gun so you have either:
Precision Shots on all the shots fired by the Gun (4x Twin Linked Quad or 1x Icarus)
Fast Shot that ignores Jink (5x Twin Linked Quad or 2x Icarus)
+ Illic shooting whatever he wants...