After the Dark plain incursion was pushed back, the empire was cracked and broken. The majority of the high wizards had been picked off by nightling assassins meaning that the incursion could only be pushed back and contained, not eradicated entirely. It was decided that the remaining armies should be used to guard the rest of the land. So the keep towns of Thorus and Anthorus were used to house the guard. Anthorus fell almost immediately, but the line was finally secured. Now the Kingdom of Guardians holds an almost religious state and each region pays it's tithe of able men to keep the force strong.