One must cross the thunder plains from one end to the other on the longest route, a 6 mile journey. This takes 2 hours for the average human to cross and will provoke up to 6d6 thunderbolt attempts (3d6 every hour spent there). Lightning bolts occur so often that charges do not build up quickly, only dealing 4d6 electrical damage with a DC 15 [[Reflex]] save for half. If all Reflex saving throws are made successfully during the crossing, the challenge has been passed, otherwise you can continue to pass through the 6 mile journey until you succeed.