[Nuggie]

As a necro, my best exp was with another necro.

Charm a stationary mob. So when it gets low on health you can take it back to its spawn point, fd, give it 45 seconds to heal, charm again, and pillage more. With two necro's doing this the exp flows fast. Necro's can heal themselves, mezz during charm breaks, root. Lots of tricks up a necro's sleeves where the undead are charmable.

Edit - that being said, my best exp on my cleric was with an enchanter charming those silly OP rogue pets. If you root the mob and time things right the cleric can step in right before a backstabbing is supposed to land and most of the time not take melee damage before you get out of melee range again.