Kara-Tur the Pretender

"You elected me! I AM THE KING NOW"After being elected unanimously in the Kingsmoot, Kara-Tur Gemtooth (also known as Kara-Tur the Pretender) became King-Elect. But, the process was rigged from the start: unlike normal, there were only 2 candidates for King instead of three. While taken to be a sign from Moradin that the Fiendish Times had not gone unseen by him, and it was a sign of the urgency. After all, King Erick Deeproot had died during the first wave of demon attacks, so there was real urgency in electing a new King as soon as possible...

Inauguration
As Kara-Tur was about to be inaugurated, he overplayed his hand. He bought out the High Priests to rush through the ceremony guaranteeing he would be able to obtain the Dwarvish Artifacts before he could be stopped, but this exact action sparked enough doubt in the minds of the Forgefavored Clan led by soon-to be King Brog to stop the ceremony. Combat ensued, with Kara-Tur teleporting away after taking just a few of the artifacts.

Revolution
After the failed inauguration, Kara-Tur claimed to be King anyways. He teleported to Moradin's Pride and began raising support for his cause, but at the same time so was the Forgefavored Clan to oppose him. After chasing him for weeks, most Dwarfs were convinced that Brog was right and Kara-Tur wrong, and thus his 'rightful claim' became a failed revolution.

Death
After losing his 'rightful claim to the throne', Kara-Tur fled to the mountains. A patrol of Azers found him however, and soon the Forgefavored Clan was on their way to defeat him in battle. And that they did: it turned out that Kara-Tur was actually a Dragon in disguise and after a short battle, Kara-Tur was no more. The Kingdom of the Infernal Forge was saved from his rule, and another Kingsmoot ensued.