You give Ciandra, Arcanum Alchemist Reflective Shard.
Ciandra takes the shard and examines its reflective surface with a satisfied look.
Ciandra, Arcanum Alchemist tells you, "I take it the Nullification Barrier held. I knew it would! The Harbinger should be severely weakened as long as the field holds. I would suggest attacking him soon if you haven't already."
Ciandra, Arcanum Alchemist tells you, "Here's a small token of my gratitude. You've really come through for the Arcanum."
You've earned 7,500,000 experience.