I got level 20 taking down one of these. It conned yellow and was my first attempt w/ my druid to take down a yellow con. I snared the Bull Ele and ran it back to the bridge in case I got in over my head. I waited a bit and when it arrived it had brought a calf with it. I charmed the calf, which then attacked the bull. I feared, then DoT'd the bull. The calf, which does hit hard, killed the Bull in no time then broke charm. I melee'd the calf then snared and feared it. When I was done, I had a ding, level 20 and a last name.
Lotharun Voyager of Bristlebane.