once you are done with the gruoks, avariatus introduces you to an innate dragon ability called tailwhip. personally, i like tailwhip. i am not a powergamer, so that is prolly why. it is not a huge, game changing ability, but it does come in handy, especially in combo with some awesome buffs and/or gifts.
anyway, the dragon trainer wants you to try out your tailwhip on some grass beetles. checking your quest journal will show you that you had to pass the beets to get to the grouks, so the way there should be familiar by now. just take the monster road past the gaurd house, under the stone arch, and look for the huge tree with the three branching roots. there be beetles.
now, beets are not necessarily tough one on one, but they aggro. viciously and with much enthusiasm. however, with caution and a little judicious backing off when needed, you shouldn't need any help to take the required beets alone, if you need. as usual, you will get a combat log alert and a quest journal update when you do.
returning to avariatus, the dragon trainer congratulates you on a job well done, and rewards you with some hoard. there is also the instruction to go see kerian, for your next job!
tell you more about it next time!