Doomsday Cannon
Aaaahhhh...the Doomsday Cannon....the sweet, sweet Doomsday Cannon. This one part Lascannon, one part Plasma Cannon, one part Battle Cannon and one part Railcannon is noted to be one of the most ridiculous guns available to the Necrons.
Only found mounted on a Doomsday Ark, which is in itself nothing less than an enormous self-propelled Doomsday Cannon. This is a weapon that can win a battle with a single shot. And most often, this can play through on even tabletop. Even fired at low power, a Doomsday Cannon is a fearsome weapon; when firing at full effect, its searing energy beams burn many times hotter than more conventional Plasma Weapons. Infantry squads caught in the Doomsday Cannon’s fury are obliterated instantly whilst armored vehicles are reduced to glowing slag. In the face of a shot from a Doomsday Cannon, nothing less than a Titan’s Void Shields can hope to offer more than a fool’s hope of protection.
As overwhelming as the Doomsday Cannon is, fortunately there is a crutch, the weapon requires immense amounts of energy to fire. Due to the energy constraints that are inherent in the design of a Doomsday Ark, a Doomsday Cannon can only be fired at full power whilst the vehicle is not moving. This is because the weapon draws on the same power reserves as the repulsor engines of the vehicle.
Any systems not directly pertaining to the Doomsday Ark’s main armament are part of the motive units that power its anti-gravitic engines and propel it into position, or the shielding arrays that give the vehicle some measure of protection from enemy fire. Each of these secondary systems draws power from the same source as the Doomsday Cannon, and much of the pilot’s concentration is taken up ensuring that the energy distribution is appropriate to the tasks at hand. As a result, a Doomsday Cannon is somewhat less effective when fired during or immediately following any significant movement of the craft, due to the need for the pilots to redistribute power to the dimensional repulsor motive units that keep the Doomsday Ark aloft. This forces the Doomsday Cannon to receive less power and fire a weaker, though still powerful, blast. Then again, even a low-power blast from a Doomsday Cannon rivals the most hallowed of Adeptus Astartes Plasma Cannons for destructive potential.
Doomsday Blaster
A cousin of the Doomsday Cannon, the Doomsday Blaster is a heavy Necron weapon mounted on the top of the Canoptek Doomstalker. Unlike the regular Doomsday Cannon, the Doomsday Blaster has a more dial-a-yield effect that allows it to switch from a wide-spread anti-blob exterminator to a more focused, "turn-a-Land-Raider-inside-out" beam of assfuckery. This makes the weapon extremely versatile and lethal to anything not wearing Void Shields as standard issue.
On the tabletop, the Doomsday Blaster's crunch is actually pretty accurate to the fluff. There are two modes for the weapon. The first is the Low Power profile, which has a short-range of 24", much like a particle shotgun. It is a S8, AP-2 D3 weapon that would easily cleanse a blob of tarpitters, although TEQs and Light Vehicles should be able to survive just fine if the dice gods are in your favour.
The second is the High Power profile, which has an increased range of 48". This more focused shot has a whopping S10, AP-5 D6 statline, allowing you to punch holes through even superheavy units as that nasty AP value makes any unit, even ones with Sv2+, absolutely impotent. However, it can only be utilised when the Doomstalker is standing completely still, limiting its overall utility of the Doomstalker.