World of Warcraft Mark of the Demon Legion Quest Guide

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Though difficult unless you have someone to decurse, if you defeat Gravax the Descecrator outside of the Temple of Elune in Val'sharah, he will drop a Demonic Emblem that will start the quest "Mark of the Demon." The reason I suggest a decurser is that he casts a spell called Doom Guard's Curse that does over 1M damage without mitigation. Once defeated, find Isoraen Nightstar outside of the Temple of Elune if you have already obtained the Tears of Elune, or inside the Temple of Elune if you have not.