Yeah, and they say they have elemental transmutation but obviously don't. :v I just don't care about the dumb fluff (except the manual because its hilariuosly stupid), and he's cherry picking game numbers when it suits him and fluff shit like the stupid intro when it suits him.
Oh wait, TA fans are dumb, who knew??
Oh wow you sound like your jimmies have been rustled (If you don't know what I'm talking about its an internet meme). You accuse me of cherry picking but you disregard everything including canon fluff calling it stupid in favor of the limitations in a late 90s game engine
Anyway,Yes, they obviously have elemental transmutation if you can change dirt into living thinking people in seconds and create nuclear weapons, or whatever there is only one explaination for that.
What calcs do you want to use? We could use the Galactic War Reports that say 200 units are capable of unleashing gigatons of firepower, in game calcs that suggest megaton level firepower, or trees.
All right. The trees in TA, standard, visually look about 100 or so meters high, IIRC. The Krogoth is also similarly high. Given the speeds of lasers, and assuming lightspeed, the trees hence would be ~0.2 or so lightseconds high. That means actually a 60,000 km high tree, which is also about 3,000 km in radius. As most wood is buoyant in water, I'll use water densities for the tree, giving it a mass of about 1 ton per cubic meter. Hence, the tree will mass 5089380098815465046309482280.9128 tons. Which means 5.089*10^30 or so kilograms of matter. A total conversion of 1 kg is roughly 22.8 MT rounding for convenience, so that means an equivalent of 10^37 tons of TNT, or about 4*10^46 J per tree converted into energy. The D-Gun takes 2000 energy, and a tree gives 250, so 8 times that, which means that the D-Gun fires a weapon with a yield of 1.6E47 J. Obviously this is retarded but we can use this if we are going to be extra-literal with gameplay mechanics. Also if we are disregarding fluff 40k doesn't really have anything.
Also what kind of resistance can they expect on a planet that the Necrons have awoken on? You keep saying they "get blown the fuck up" but you don't even bother saying how. As for their grand plan I guess they do what they always do mine the planet out, build up an army, crush the resistance, take any tech possible, teleport out to a new world, rinse and repeat. In the Galactic War Reports, IIRC, there is some mentioning of their space capabilites like 30,000km long Dreadnoughts or ships large enough to evacuate billions of people off planets, though it doesn't state what kind of firepower they have, but with the galaxy depleated of materials they don't seem to build those anymore.