After the cutscene involving Sorean releasing the seal on Zanza on Prison Island, the weather on Eryth Sea, Alcamoth and Prison Island will all transition to a permanent thunderstorm on a random hour of when the next weather change occurs in the game, if the weather isn't already thunderstorm. Changing the time in the game will instantly make the weather change to thunderstorm. The permanent thunderstorm weather effect will remain in Eryth Sea, Alcamoth and Prison Island until after defeating Metal Face. Upon finishing a certain part of the story, Eryth Sea becomes filled with Telethia.