Use your Arcane Torrent racial ability on a Mana Wyrm, then return to Arcanist Helion.
If there is only one lesson you deign to remember from your time on Sunstrider Isle, let it be this - control your thirst for magic. It is a thirst unending, <name> - what you absorb must be controlled and released via Arcane Torrent. Failure is to become one of the Wretched... hopelessly addicted and insane.
Seek out a mana wyrm and unleash your Arcane Torrent upon it. Learn to master your power. When you have sufficiently released an Arcane Torrent, return to me.
You can choose one of these awards:
Ah <name>. Have you completed your task?
You've done well today, <name>. Your willingness to learn shows that you may very well rise above the unyielding cravings you must endure as a <race>.
Rest not on your laurels, young one, but instead seek to master what you have learned. Only through diligence will we as a race survive.
Upon completion of this quest you will gain: