As the lizardfolk assaulted now well worn group of adventurers, they were forced to flee and leave the swamplands behind. They needed time to rest and lick their wounds before they could mount any sort of raid to the said ruins again. They ´retreated´ to an nearby village, that was on the outskirts of the swamp, and while they were resting, the village was hit by an meteor. After math of the explosive force, fumes from the swamp and the quasimystical meteor fragments made the ancient graveyard to raise. Zombies and more foul undeads risen from their eversleep.