You say you are not bound by the will of the Lich King, and the enchantment Bethor placed upon my book corroborates this. But before I believe you I must have proof that you are enemy to the Scourge.$B$BThere is an old, bloody altar just off the southern coast of this island. it is used by a powerful Scourge agent, Lillith Nefara.$B$BTake a Candle of Beckoning from this crate here. Light it on the altar and Lillith will awake. Destroy Lillith, and I will believe you are the Lich King's foe.
Obtain a Candle of Beckoning.$B$BSummon Lillith Nefara and kill her.$B$BReturn to Gunther on his island.
Return to Gunther Arcanus at Crusader Outpost in Tirisfal Glades.