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Garrison Destroyers
Hunters, patrolling the imperial lands, have discovered clusters of unfamiliar free heroes in rarely visited areas. These groups are moving cautiously but steadily towards inhabited areas. They are reluctant to engage in battles, but they put up a decent fight. Those lucky enough to emerge victorious from trial battles vaguely hint at "gold and trinkets in the backpacks of the defeated."
An urgent analysis of available archival records has shown that a similar scourge occurred many years ago, just before the last invasion of our lands by hordes of barbarian outlanders. The vanguard units of the aggressors then sought to destroy the Garrisons guarding the capital's surroundings, in order to ease the passage for the main forces. And some of them succeeded. To destroy a Garrison, the attacker only needed to get close to it and spend just five minutes near it. Apparently, powerful magic was used, which also prevented the restoration of defensive structures for quite some time.
The situation was further complicated by the fact that the world was then fragmented not only by inter-factional warfare but also by conflicts within each faction. Many heroes of those days, willingly or unwillingly, helped the interventionists, preventing sincere defenders from offering worthy resistance to the enemy. As a result, the invasion was long and bloody...
In a hurry, the Council of Factions began to discuss options for repelling the enemy, so as not to repeat past mistakes.