Found out all you need to do to open multiple clients is to close the Tera launcher after logging into the game with 1 character, Opening the launcher again and log into an alt account.
I made 4 characters to auto mine Xermetal ore, Only problem is it will take them 1-3 days worth of points to reach a level to be able to mine it. After that though I will be making a decent amount of money AFK in just a couple hours every day.
Another awesome thing is that they are still level 1, So they cannot be killed by outlaws.
It took 1440 points about to reach level 105 from level 0 only attempting to mine the Xermetal ore, And you go through them fast so it was around 105 levels in 20 minutes or less.