You can gain a silly amount of EXP if you're low level with a 120 friend/main that does the following WQ Hundred Troll Holdout
Observations:
- Even after completing the WQ, the 120 can carry on grinding
- Whilst the 120 farms the WQ mobs, you could afk nearby gaining silly sums of exp
- You don't even need to be in the same phase as the 120 to get the EXP - so safely afk in the PVE mode
- Could easily level alts with the above method if you multi-box (or customers if you're in the boosting business)