The islands are invisible until within 10 feet of them. Once within 50 feet, extreme high winds will buffet them back to where they came from. There is a 20% chance that a galley will ship water, 10% for other ships. Speed will then be reduced by 1/3 until it can dock and make repairs.
• Sea serpents, lesser (water only): AC5, HD6, hp 25, 33, 29, 23, At 1 bite (person) or squeeze (ship), D2-12 or 1-10, save F3, N.