The Nekrutan 'Crisis'

The crisis, which is eponymous for the Lord of Death, began when the god was considering new ways to spread undeath amongst mortals. He thought about his reputation, his symbols, and his powers, and came up with the idea for the Nekrutan worm. It was a fitting creation, as his symbol involved a worm emerging from a skull’s eye socket. Knowing his goal, but needing a bit of help on the finer points of magic, he enlisted the help of Quetminook, who was only too happy to assist.
It took but a bit of time, and even less help than Nekrutan had expected from Quetminook, before the worms were ready. Once deployed, they worked just as Nekrutan had designed them. They spread like wildfire, consuming and reanimating village after village.
The rest of the world, out of fear and hatred, brought into being the goddess Chenravo. This new goddess, out of sheer luck was able to craft a race immune to the worms and sink part of the world in the creation of the Deadlands. The new goddess probably had help from Quetminook, who would have had half an idea on how to counter the worms he somewhat understood.
Remember that no matter how well laid your plans, fate may have a different direction. Remember your foes, and those who have wronged you, and one day you will make them pay for their transgressions.