War of Shadows (5E)

From publisher blurb: War of Shadows is an 8th-level adventure that picks up where Between a Rock and a Charred Place left off. Erod Flan weathered the dark folk’s storm, yet the conspirators are not done. Their focus now turns to the critical outpost of Tyr Whin. The PCs and the outnumbered defenders must somehow stop the hobgoblin warlord, Grugdour, and his army from overrunning the citadel and opening a beachhead for invasion into the Stoneheart Mountains.