These living "vehicles" are apparently giant insects with mechanical components that served in the arsenal of the Sabaoth of Babel, until their destruction in their ill-fated assault on Rephidim. These giant fliers get their name from their weapons of choice: They carry within them biological weapons -- poisonous spores, disease-ridden vapors, and sometimes swarms of smaller bugs, such as horribs.

While the Plaguebringers are armed to resist most any blow, it was discovered that they have two weak points: their wings, and the "eyes". The pilot resides in a hollow space in the head behind the latter, making him vulnerable to attack.