I love the artwork on this faction! You really captured the Viking walrus look :)
I like the whole economy of items this faction creates for everyone to use. It is a little complex so I might be missing the downside for other players having the monopoly items in their crafted items box. It seems like they would want to exhaust them every turn to get the extra actions, but Chastise and Refresh makes it seem like the Raiders want other players to have a lot of Monopoly items that they leave unexhausted.
If you've tested them out I'd be curious to know how their scoring compares to other factions. My initial thought is that they might need an extra way to score more points, maybe related to Chastise, because Count the Spoils seems like an expensive way to score points.