The Empire's Decimator Core is the tier three Empire super weapon. This weapon is extremely powerful verses structures and units in its range. It functions much like the Allied Particle Cannon it annihilates anything in its path.
Placing the Decimator Core is very important since like the other super weapons it appears through the fog of war. You want to make sure that you can protect it very well as it is extremely expensive and if you lose it, you will probably lose the game since you wont be able to come back from a loss that large (economy wise).