Playing a build where I was able to level inside monoliths starting at about level 35. At level 48 I went back to resume the campaign and teleported to the “shining cove waypoint.” I realized I needed 2 more levels to unlock my last ability slot and teleported back to the “fall of outcasts” waypoint in the end of time.
I immediately received the notification “You are now level 55”. I gained 7 levels by teleporting waypoints. I’m unsure what specific circumstances produced this and don’t know if I could replicate it.