Energy Weapon
The Annihilator and Doomsday Machine are one of the most powerful structures you can build. They are Tech Level 3 structures, built by the most advanced construction units available.
The Arm Annihilator
The Annihilator is an offensive and defensive weapon that fires energy shells from its three guns, and is effective against the stronger units, but can easily be taken down by many weak units. It does massive damage, but shoots slowly and takes a lot of energy to fire. Although expensive to build, and time consuming, it is one of Arm's most powerful structures.
The Core Doomsday Machine
The Doomsday Machine is equipped with a cannon that fires explosive energy shells. Like the Annihilator, it is time consuming and expensive to build, it is extremely powerful and very effective. It can become a linchpin of your base defense the moment you build it.