A faction is the four ones you see in Junon. The Arumic Researchers, the Righteous Crusaders, the Junon Order, and the Ferrel Guild. Each of them have different quests and have only one(1) unique item. Usually, when joining one, one of the reasons are either friends are joined there or you're after the item. Also, you may join and quit factions anytime, but faction points are not shared, so if you want some costly faction store items it's advised to get it from only one faction. Points are hard to get, since every quest gives you about roughly 1-2 points. But, that's where Union War comes in. It feels like clan vs clan but it's union against union. The unions are the ferrel and crusaders, and the other one is arumic and the order. You can win almost 10-20 points per UW when you win, but you still get some points even if you lose.
I suggest Arumic Researcher when gathering points. The shout quest they have is very easy, and it gives a good amount of points too.
To get faction points, simply either win UW's or finish their quests.
Edited by Vaant, 08 January 2008 - 09:32 AM.