All mages learn some magic that harnesses the power of the sky, but only a few have the dedication to become Stormlords. Masters of the weather, Stormlords wield a unique arsenal of sustained damage-over-time spells. They are tougher than mages, but give up some of their surging power as they favor more reliable, consistant damage.
Like all Prestige Classes, they retain the original class's Prime Requisite, in this case, intelligence. Stormlords find the magic of Sorcerers to be a perversion of nature, and thus never gain access to that Remort Class.