This lore can be obtained while doing the quest "Liberating Sobrik".
One of the great conundrums facing modern war strategists is how to defend a planet from orbital bombardment without encircling it in a costly permanent defense fleet. Most major governments employ planetary shields as a countermeasure, but these offer no protection against dropships bearing armies whose first objective is to destroy shield generators. The war technologists of Balmorra spent decades researching an offensive method of protecting their planet. The result is the Barrager superweapon, a series of planetary scale turbolasers that can target and destroy whole enemy fleets in orbit, neutralizing both bombardment vessels and landing parties in one fell swoop. For years, the primary obstacle preventing completion of the Barrager was the enormous power costs associated with such a weapon. How its engineers overcame this dilemma is unknown, but at last report the weapon was nearly ready to go online.