Relative Island: Lavastorm The Cauldron sits in a locale with an extremely large number of geothermal vents beneath the waves. The sea boils and large bubbles may form that can actually cause damage to a ship’s hull should they collide. Whirlpools are a common sight in this sea. Some portions of the Cauldron can only be navigated by ships reinforced by great magic or technology to survive the boiling sea and searing winds.