There was once a race of great evil on the planet. It terrorized the creatures that had been living peacefully. Many in their own race even feared each other. They caused destruction wherever they went. Some of the greatest forests fell to ruin and many, many creatures lost their homes while others lost their entire existence. Wars among themselves only brought forth more ruin.
They ruled the planet for centuries. They brought only chaos and suffering to the world. They cared little for the other inhabitants of the planet. They would even torture their own kin to death if it gained power for them. They were all power hungry and wanted only to be in control of all the rest. In the end, its said that it was their own greed that caused their downfall.
The tale goes that they were having a large scale war among themselves, and a disease came about. It was fatal; any creature that had it would die within a maximum of three days. Some of them got the idea that they could spread the disease around the enemy borders. They did so, but it had a result that they had not accounted for. Some that had the disease traveled long distances and the plague traveled with them. In the places where the plague traveled to, there were even more traveling. Before long it spread everywhere. All of that race, and somehow only that race, was dying of the plague. It wiped them all out. Their civilizations and creations fell to ruin that could only be compared to the ruin they themselves brought upon the planet.