Contract: The Phantom of Eldberg is one of the witcher contracts available in The Witcher 3: Wild Hunt. Geralt of Rivia can first hear about it after defeating Lugos the Madman at fisticuffs during the feast at Kaer Trolde castle. Otherwise, reading the notice outside the inn in Arinbjorn or talking to Jorund about it after arguing with Kori and Kraki will also start the story.