Heart Attack

As if a curse of ill-fortune is not enough, my research also indicates that the Heart of Aveliyan will be the bane of any Dark Elf who dares to touch it. Such was Aveliyan's hatred of our people that, even after his death, his heart can bring about the demise of any Dark Elf it comes into contact with. To circumvent this, you will need to acquire the hand of Istranlas Shiningmoon. Istranlas Shiningmoon is a Dragon Prince of Caledor. It is said that those of his lineage possess an ability to communicate with Dragons that is so powerful, it is as if they have Dragon blood running through their veins. With our assault upon Caledor, Shiningmoon has made his way to aid his brothers in battle. You will need to recover one of his hands if you wish to take the Heart of Aveliyan.

Find Istranlas Shiningmoon. He is likely to be found aiding the other Dragon Princes in their patrols of Caledor to the southeast. Defeat him, and claim one of his hands. Return to Arthon Nenara in the Uthorin camp at Drakeshadow when done.