Slay Lathoric the Black and Obsidion, and return to Thorius in Ironforge with the Head of Lathoric the Black and the Heart of Obsidion.
It... It... It was all a trap. Forgive... me. Kill the bastard... Kill him for us... for Thorius.
I don't believe you! Show me proof!
<Thorius' face turns white.> This... this cannot be. My own brother? He set this all up? <Thorius' face contorts in anger.> He betrayed me, he betrayed Ironforge! It seems as if the influence of the Old Gods is still strong in these lands. I fear that if my brother - a once noble and honorable man - was so easily turned to the will of Ragnaros, no one is safe.
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