The Narrow clan are a regrouping of player (an alliance).You must ask at the leaders of the clan and add the name of the clan (NU by exemple). I hope that I helped you!
Several clans with N1 (Nice1) and NU(Narrow Union: an amalgamation of 5 clans) being the biggest. No perks by joining other than clout chasing and possible bounties on your head in game by rival clans. Finding out who wars with who would be a good lore chart. Good luck, Narcher.