Editing Warhammer 40,000/Tactics/Necrons(8E) (section)

===Cosmic Fire===
Roll 1d6 for ''each'' enemy unit within 9", adding 1 to each roll for a Vault; on a 4+, they suffer 1d3 mortal wounds.

You'll want this power if you plan on getting up close and personal, as soon as you get within 9" of 3 units this becomes better than Antimatter Meteor, it can be absolutely brutal if your opponent has more than that. An excellent power for both C'tan and Tesseract Vaults if your opponent fields a list that relies on aura abilities, they'll be likely to clump up and you can deal mortal wounds to their characters. You will most likely want a longer-ranged back-up power if you pick this one, as while it is brutally effective at what it does, you might not be in range every turn.