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If you ever played WoW in the last couple of years, it's basically exactly like the follower system with the mission board there.
If not, all of your max level characters can go on a mission, which happens passively while you can still do whatever you want. When the mission time is over, you can collect your rewards, which are Antiquity Points and Vanguard Exp. If you get a 'Grand Discovery' (chance of that happening is determined by the points and bar under the character slots) you additionally get a pouch. The higher your Vanguard level is, the better the Grand Discovery rewards. With the Antiquity points, you can purchase items in the shop that's present in the Vanguard UI (Toys, Titles and some other stuff).
Also, the EU population was sort of hurt by the fact that they didn't exactly communicate the merge correctly. A friend of mine wasn't playing during the time where you had to agree to the character transfer and he'd now have to start over completely. Naturally, he doesn't even want to hear about this game anymore. If they had just sent out reminder E-Mails, he would probably still playing.
I dunno how many people this affected, though.