The Hungering Deep
Merrick appears on Sharkbait Cove to tell the tale of how he summoned The Hungering One. Subsequently, he recruits other pirates to go to the specific co-ordinates of T-27 whilst playing his enchanted shanty to defeat The Hungering One in his steed.
He placed journals around the Sea of Thieves that told his tale and gave pirates who sought these out replicas of his drum as well as a unique tattoo. During the summoning of the Hungering One this tattoo would glow.