Collect 6 Arcane Slivers from any creature on the isle that uses mana, and then return to Arcanist Ithanas on Sunstrider Isle.
It's a shame that we've lost control of many of the creatures here on the island. This was once a tranquil place of study and research. Now it's all we can do to keep from being attacked by our own creations!
I'm going to offer you a chance to receive a magical boon in exchange for some collecting work on your part. Bring me a stack of arcane slivers that are found on the mana-using creatures of Sunstrider Isle, and I will cast a spell on you that should aid your adventures on the isle.