First get your runners the best weapons and armor. Now everytime you leave your tower you can instantly teleport back to it and ur runners will probably be back. You can find vendors over in Camps Eagle Nest (if you don't kill them) which you have to go through a certain teleport in orbos fjords in order to take down the barriers. Later you can find more vendors in Aleroth and High Halls, which you can fly to after you take down the shields.
