The Riverdale Adventures
Fort Black lies on Hilltop’s Northern Border with dozens of other outposts. These all protect the Northern border from monsters from The Witherlands, which would otherwise come and terrorize the countryside.
Fort Black is named such because the ash from The Witherlands coats its thick stone walls and gives them their dark color. The soldiers there are sometimes (usually jokingly) referred to as blackguards. The soldiers themselves have little time to care about such comments, as their walls are constantly beleaguered by monsters.