Romsca was a female ferret corsair and the captain of the Waveworm. She was Conva's first mate and became captain after his death. At the request of Ublaz Mad Eyes, she and her crew escorted Lask Frildur and a score of his monitor lizards across the western sea to Mossflower Woods in search of the Tears of all Oceans. Since the Pearls were within the walls of Redwall Abbey and had not yet been discovered, Lask captured Abbot Durral for ransom, and Romsca sailed the Waveworm back to Sampetra with the captive.