Editing Samsara:Settings (section)

===Heatstroke ===
Zakhara is, to put it mildly, hot most of the time in most places. Anyone who spends any significant time in the sun faces the possibility of heatstroke. For every hour spent in the sun, an actor must resist the effects of heatstroke. This is a Simple Contest, in the physical sphere. The actor’s modifiers are STA + WIL; the Contest rating for the sun is +5 for “normal” hot conditions with an actor undergoing normal exertion. Additional exertion or unusual conditions will increase the CR. 

Success results in no ill effects for the character at this time. Failure results in checks as per normal contest rules. But note that the contest does not end until the actor gets out of the sun and recuperates; if the actor is spending all day in the sun, the contest will go on for quite some time. Severe checks are heatstroke: these are physical checks that will only recuperate at a rate of 1 per each day spent hydrated and out of the sun.