[quote=Deepstrike101]The battles happen in three stages: At distances of about 7.5 billion kilometers, close to the distance between habitable planets and the outer edges of a solar system, ships are arranged in a very loose formation (out of visual range of one another) and bombard the enemy with extremely destructive weapons.[/quote]

At that range the enemy can annihilate anything you fire at will LONG before it gets near them.

[quote]The ships are equipped with extremely effective countermeasures, capable of jamming almost all incoming missiles and given the proper distance, diverting solid projectiles. They are also equipped with shields powerful enough to allow them to fly through the outer layers of a Sun like star. The weapons imperial ships mount include 500 tera-ton nuclear missiles and EMACs (ElectroMagnetic Accelerator Cannons). [/quote]

500 Teraton Nuclear Missiles? 

You do know how way over-the top it is right?

It makes the asteroid that wiped out the dinosaurs look like someone shooting a BB gun at the planet.

[quote]The smallest EMACs fire 30x10 meter cylindrical projectiles of solid depleted Uranium at just over the speed of light, resulting in about 8 x 10^27 joules kinetic energy (if I did my physics right). [/quote]

You definitely did not do your physics right if you're firing a solid depleted uranium round at "just over the speed of light" in fact, at even 60% the speed of light it literally wouldn't matter if your projectiles were made out of spit and dirt or tungsten, when it hits it'll release its weight in antimatter as far as destructive potential goes.

[quote]Anyways, this is the sort of weapon, were I doing a nations roleplay, I would categorically forbid anybody from using. I am definitely rethinking and redesigning the power of this weapon, and I need your input. What do you think is reasonable for an ultra futuristic empire which spans several galaxies to put as the main armament on corvettes? Are even the 500 teraton bombs still over powered?[/quote]

Overpowered, certainly, but most importantly. RIDICULOUSLY inefficient.

It would be cheaper, and much more destructively efficient, to use 500'000 1 Gigaton Missiles than 1 500 Teraton missile.