Carnage at Keldor Keep

From publisher blurb:

This week’s Filbar offering is a mid-level adventure with the party headed out towards the frontier. As they move towards high adventure, adventure finds them first! Keldor Keep is the last bastion of civilization on the frontier but has recently come under attack. With its defenders scattered it falls to the party to save the fortress and protect the border! A hit at Who’s Yer Con 2016, this adventure is more than enough challenge for a group of 4-6 level characters!

Set under the 5th edition ruleset this adventure makes for a good addition to a campaign or a useful “one-shot” adventure. This challenge takes place near a frontier but is easily adaptable to any campaign or setting.