One of the bloodiest times of Blackmoor's history is known as the Mage Wars. As more and more mages learned to make use of the strong magical energies of the North, the rivalry between them gradually grew into open hostilities. Among the Wizard Warlords, the most ruthless at this time was probably the Half-Elf known as Raddan Goss. It was only with his defeat at the hands of the Skelfer the Arch Mage that the Mage Wars came to an end. I have previously speculated that the energies released in battling Raddan Goss was what eventually awakened an ancient evil, sleeping in the deep waters near Blackmoor.

The legacy of Raddan Goss lives on even in later day Blackmoor, as revealed in Night of Goss, a recently released episode of Blackmoor the MMRPG over at the Comeback Inn.

Full version of this article here: http://blackmoormystara.blogspot.no/201 ... -wars.html

-Havard

Personally, for Blackmoor related, homebrew campaigns, I'd see Mage Wars as a possible recurring theme in the history of Blackmoor, with mages (once every century or so) building up their towers and fighting each other for supremacy and power (until they almost annihilate each other).
After all, one of the reasons why Blackmoor at it's beginning attracted new colonists relates with the particular magical aura of this area...