The Jade Mountain Prophecy
Eel was indirectly mentioned in a scroll called The Animus Histories which talked about the Royal SeaWing Massacre.
Though not by name, Eel was mentioned as one of the victims Albatross claimed when the Royal SeaWing Massacre happened.
Eel was seen briefly, laughing, talking, and enjoying himself with the rest of his family at the party just before the massacre occurred.
Present: Abalone • Flounder • Herring • Kelp • Lagoon • Nautilus • Pearl • Piranha • Riptide • Snail • Snapper • Squid • Tempest • Tortoise • Urchin • Webs • Whirlpool