One of the moodier trailers shown at the Humble Games Showcase today was for Cataclismo, a new base building tower defense RTS from Digital Sun, developer of The Mageseeker: A League of Legends Story.
Cataclismo is a game about building fortresses, "brick-by-brick," in a dark fantasy world where a deadly mist has enveloped the landscape. In the trailer, the camera moves slowly through the game's murky world, showing us swarms of ghostly white creatures in the midst of attacking a towering fort defended by medieval archers.