I take no credit for finding this!!!
ALL CREDIT GOES TO @Alec Cheng II for finding this amazing trick!
Please visit this thread HERE and thank her!
Here are some descriptive instructions:
1. Download EZBossx and apply the correct HFS files.
2. Go in a battle and transform, making sure you get your 100 xp first.
3. Finish the quest then wait for the screen to appear AND disappear. DO NOT PRESS CLOSE!
3. Transform with F6 or F7 depending on if you are Dark Knight or Paladin then immediately left click on the buff icon below your HP bar to cancel it.
4. Keep on transforming and canceling over and over again until you have all of the EXP you need.
NOTE: This only works ONCE per hour so don't leave the battle until you have as much exp as you want. You MUST be level 40 or higher and have completed the path quest and chosen to become a DARK KNIGHT or a PALADIN.
Also, This works for Paladin AND Dark Knight if you follow these instructions.
Once again, give some thanks to @Alec Cheng II