What follows are a couple of musings I've been kicking around lately about the Titans, the Well of Eternity, and other unusual places of magical power scattered around Azeroth.
Most know the Titans, those great big metal space-giants who came to Azeroth in ancient times, gave the elementals the boots, swept the resident Lovecraftian alien gods under the rug, and generally made the place presentable. And many are familiar with the Well of Eternity, a great big pool of magical power that the Titans left in the middle of Azeroth's single great continent, Kalimdor. The Well was the source of all magic in the world, and had lots of transformative effects, turning nearby trolls into the first elves as one example.
And there are other sights of Titan power too - most relevant to my musings are Un'Goro Crater in Kalimdor and Sholazar Basin in Northrend. Two lush jungle valleys located in otherwise harsh and inhospitable extreme climates (a desert wasteland and a frozen wasteland, respectively).
Mists of Pandaria gave us the Vale of Eternal Blossoms, which has some similar properties to both the Well and the valleys - a bountiful never-changing climate, and a source of transformative waters that were responsible for changing several of Pandaria's races into their current forms (the mogu and the jinyu both benefited from exposure to the water). Water from the Vale also causes pandarian crops to grow to massive size.
So in addition to the Well of Eternity, we also have secondary places of power with similar properties being scattered around Azeroth. The Sundering may have stripped many of these of their maximum potency - we have no sentient lifeforms dwelling in Un'Goro Crater (although the raptors are pretty smart), and a few fairly primitive folk in Northrend's Sholazar Basin (the gorloc and the wolvar). The Vale in Pandaria seems to have retained all of its power - perhaps due to the Pandaren Emperor's spell that protected it from the Sundering. That gives us a secondary well on the northern, southern, and western continents. So what about the Eastern Kingdoms...?
Well, there is a certain dragon's lair filled with unusual water hidden somewhere in Tirisfal Glades... A place of power that once drew the elves to it after the Sundering, but eventually caused them to go mad and flee the area. It was long speculated that an Old God might lie beneath Tirisfal, but that rumor was recently dispelled. We were told it was still bad. What could be Old God level bad? Perhaps a secondary well of Titan power that has become polluted or corrupt post-Sundering? If a secondary well that has retained its potency can make the mogu out of simple creatures and the jinyu out of murlocs, what could a well that's gone stagnant give rise to?