Return to Nautica once Alizarin has been defeated and have the Queen turn you into a fish. Swim down to the depths and over to the Courthouse to find a mermaid in need of assistance. She needs you to find the legal notes from her mentor to help her in her case. Zoom to The Strand and sail north to Insula Occidentalis where you’ll find a cabin. You’ll find the notes in the chest inside, return to Nautica to hand them over and complete the quest.