In the Moon Bog

From the introduction: Some time ago, the Screeching Comet shattered the night skies and crashed into the Moon Bog. Since then, a creeping doom has slowly warped the flora and fauna of the area. Those spending too much time in the bog are overcome by an alien sickness. Recently, mutant man-frogs have been encountered and villagers have gone missing. What horror resides in the Moon Bog!