Hidden deep in the borderland forest, bandits lurk in the ruined castle of a long-dead border lord. Their incessant raids draw a band of neophyte heroes to the derelict keep. There they discover fouler, more odious dangers lurk below the ruins. Dare you brave the terrors of the Shadowed Keep to crush that which lurks within or will darkness shroud the surrounding lands? Shadowed Keep on the Borderlands is an adventure for 1st-level characters compatible with the 5th edition of the world's most popular roleplaying game. Designed for the Duchy of Ashlar campaign setting the adventure can be easily inserted into a GM's home campaign.