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.