Dragonmarch Keep (5E)

From publisher blurb:

A lonely edifice built atop a rocky crag at the edge of civilisation, Dragonmarch Keep guard over the borders of three formerly warring kingdoms. Men and women of noble birth from three kingdoms serve at the keep in a show of unity. They push back the raiders and marauders emerging from the wastelands and strength the bonds of friendship between the three kingdoms. While the keep’s walls provide formidable protection, the surrounding farms are open to attack, usually in retaliation for a recent foray by the garrison. Dragonmarch Keep is, thus, a place of great adventure and great danger. Here, those of stout heart willing to stand against the forces of evil and chaos are in high demand.