Quote Originally Posted by Hardcore Scape View Post
Any boosting has to be done open world from my testing. Even if you leave the group while in the dungeon everyone in the dungeon gets split XP. I've been boosting my friend open world and I've gotten him 150-200k xp/hour from lvl 45 to 55. He uses oils and dynamite to tag since he's a rogue while I round everything up with demo shout. After he tags I AOE with mages and warlock.

If you want to be able to help kill the mobs on your 60s the mob has to be not a skull for them and at least green for you (48+ at lvl 60) else all you can do is tank with non hitting abilities and heal outside group
Boosting in dungeons is most commonly not done by tagging. The 60 just plows the instance. Works best as a mage or warlock that can kill the entirety of say SM cath in a single pull.

Edge case scenarios in open world will exist, but they will be often few and far between due to mob density. Not a lot of places are going to have the mobs/respawn rate to support that rate of killing. Of course, if you find a spot like you have, tagging is going to be best. That's going to be true mostly for powerleveling a single character. If you want to powerlevel 4 alts, dungeons with mage or warlock fragging everything is going to be best.