magic users.
No, I mean get out of Brakebills because we were all going to be murdered. Time magic, the only timeline we didn't get killed was by going to Fillory. To get to Fillory, we had to go through the Neitherlands, which was guarded by some bad guys. Needed to protect ourselves.
If you want to know more about Fillory, I recommend talking to Quentin. He's the Fillory nerd.