Restless Ghosts is one of many obscure side quests you'll pick up while exploring Ashenfall in Runescape: Dragonwilds, specifically, when you visit the Crumbling Well in Bramblemead. When you're nearby, you'll be able to interact with the well by pressing E, which lets you retrieve the mysterious Ghostspeak Amulet, and immediately begins the quest...
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How to complete the Restless Ghosts quest in Runescape: Dragonwilds
Source: PC Gamer (opens in a new tab)