Big Bertha is a long range plasma cannon (LRPC). Built by all T2 land/air cons it is able to shoot targets across the map. On most battlefields placing it on the front-line enables you to take down buildings in enemy’s base. Not very effective on mobile targets. When built, it immediately becomes a priority target for your foes, try to keep it safe. Can be countered with Plasma deflectors, but those come at a high cost.