A Dark Iron fortress in the highlands above the Wetlands, abandoned by them and later used by the orcish Dragonmaw clan for the worst crime of The Second War.
Using the Demon Soul, the Dragonmaw enslaved Alexstrasza, the Aspect of Life, and chained her here — forcing her to breed her own children into war-mounts for the Horde. She was freed when the Demon Soul was destroyed. The fortress was sealed afterwards, and has stayed sealed.
This is not secret history. It was twenty years ago, both sides know it, and it is the single hardest thing for an orc to answer for.
