Merrow were undersea merfolk-like monsters from the Abyss who terrorized the waters. Demogorgon often sent his merrow to the Material Plane to bully life there.[1]


Merrow on the Material Plane lived in undersea caves. They filled their abodes with treasures and used the rotted corpses of dead creatures tied to kelp to mark their territory.[1]


A merrow was often armed with a harpoon. It also fought with its sharp claws and its fanged bite.[1]


Merrow were created when a tribe of merfolk found an idol to Demogorgon that drove them all insane. The king of this tribe demanded a blood sacrifice to the idol that opened a rift to the Abyss. The corrupted merfolk slowly transformed into the monsters now known as merrow over multiple generations there.[1]




  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Wizards RPG Team (2014). Monster Manual 5th edition. (Wizards of the Coast), p. 219. ISBN 978-0786965614.