As you've probably realized by now, progression in Factions pretty much requires you to play through the missions in order. You need to pass the Eternal Grove mission in order to get into Eternal Grove (Explorable) where you can cap Rit. Lord which means you'll have to play through the campaign until you can access the Eternal Grove mission. You can cap Rit. Lord on the Luxon side too but it is in the same place in the storyline and will require you to complete the same amount of primary quests and missions.
So the only thing you can do is just follow the primary quests and missions in order. GuildWiki shows the progression of the storyline through the primaries and missions here - http://gw.gamewikis.org/wiki/Mission...ews_(Factions)
You've got 4 missions and about 8 primary quests (one of which requires you to collect 10,000 faction through more quests, challenge missions, the competitive missions, or ABs) to go.
In other words, you might want to get comfortable with a build that doesn't involve Rit. Lord.
