It's best to use 2nd reborns, I've done it with 1st, and non rb's and it's just not the same you get much less exp. I also never use less than a 130 2nd reborn. Get yourself double exp pot, and use heavens blessing to get the most out of your kills. Heavens blessing allows you to collect exp in the form of the exp balls. Yes it works, I've done this many times. Also if you don't have a water to res the person you're draining, give them heavens blessing as well so they can res right there. Keep the person you're killing naked and have them punch you or your guard depending if you're reborn so they flash and you take no pk points and just proceed to kill them. The more exp they have the higher you'll go. Best I've pulled was a 111 water to 121 with a 2nd reborn lvl 131 that had 80pc. Just find yourself a quiet spot where no one will bother you and have fun killing.