High Pass Chronicles: Hold the Line (2018)

From publisher blurb:

High Pass Chronicles: Hold the Line is a 5th edition adventure that takes places in a soon-to-be released fantasy setting, but can be dropped into any existing campaign setting. This adventure includes many three-to-four hour encounters that are designed to be run in a random order, and based on the needs and builds of the characters. It is designed for five players, but can easily be scaled up or down as needed.

Introduction: A small fort high in the mountains serves as both home and school for the characters as they learn their crafts from seasoned veterans sworn to protect the innocent on one side of the gate from the evil creatures and humanoids on the other that seek passage across in order to dominate those who cannot protect themselves. But as time goes on, the struggle against the encroaching dangers, mounting concerns about weather, and the possibility of sabotage from within lead to the inevitable conflict that will decide the fate of High Pass.