You can get exp when your charmed pet dies.
First you need to do a tiny bit of damage to it.
Then charm it and get it killed.
This works for ^^^ mobs.
A really fast way to level a Coercer.
This works amazingly well, even when grouped. It's simple to duo with this technique--one guy does crowd control and the other does the charm. It's a bit harder solo, but still possible, because of the possibility of charm breaks. You really need an ADEPT 3 or MASTER to get the most of this technique.