2009 · ソースブック（プレイを拡張するルール／オプション）

Corners of the Realm: The Myrddin

This supplement introduces the Myrddin, a secluded race of nimble eel-folk who live in massive floating cities built from driftwood and shipwrecks. Once driven from their river homes and hunted nearly to extinction, they survive at sea and use electrically charged tongues to stun prey and attackers. It provides the lore, game statistics, powers, and other material needed to include the Myrddin as allies, enemies, or player characters in 4th Edition adventures, whether the story takes place on the open ocean or inland.