From publisher blurb:
In the swamp lands of southern Usarm a horn, glowing and bright has erupted from the fetid earth. The town of Backbend has become lost within the swamps it once boarded and its people have vanished. Tyor, Sage of the Mage Academy in Coralius, and his young apprentice Cami have been sent to investigate and discover the nature of the swamp’s encroachment and that of the glowing Southern Horn.
What Tyor finds is a town overrun with Dark Elves and strange beings. Cami is taken in the night and Tyor desperate and alone sends a plea over psychic webs. Come to Backbend, breach the horn and discover its secrets and the plans of the Dark Elves… and most of all save the apprentice he regards as a daughter!
“Assault on the Southern Horn” is a new 5e/Next adventure for 4 to 6 characters of the 4th through 6th level and suitable for one to two nights of play. "Assault on the Southern Horn" featuring new monsters, magic items and a new Elvish sub-race and background!