This DLC takes place 10 years before the events of the base game and focuses on the background of Mors. It will teach you where he got his scars, where he met his dog and why he earned the nickname “The Butcher”. It starts of with you patrolling the wall with a new recruit and suddenly the Wildlings launch a surprise attack and kidnap a builder of the Wall. So you set out to rescue him with a few people and you are predictably caught and imprisoned. It is quite interesting being a slave to a tribe of Wildlings and is definitely odd seeing Mors helpless. The whole dlc will take about an hour and does not allow you to carry over your character from the base game. You have to start from scratch but luckily you level up much faster and by the end I was like level 12.
You will be scavenging for what is very low tier armor but will still feel glad when you come across it since it is much better than wearing nothing. Which will come in handy since most of the dlc consists of fighting to survive. Besides that there is nothing else different from the base game. No new armor, ablities or anything of that sort, just a story and different setting. This dlc is decent and can be played anytime you feel like it since it is just backstory. If you already own the dlc I would suggest playing it before the base game.