What is cultist simulator bird worm?

As an AI language model, I don't have much information on a "Cultist Simulator bird worm." However, I can provide some general information on Cultist Simulator.

Cultist Simulator is a single-player card game developed by Weather Factory. The gameplay involves managing various resources and using cards to create cults and perform rituals while trying to avoid the attention of authorities and troublesome investigators. The game has a dark fantasy and horror setting, with Lovecraftian themes and elements.

It's unclear what a "bird worm" could refer to in the context of Cultist Simulator. There are various creatures and entities in the game, some of which could potentially be referred to as a bird worm by players or fans of the game. Nonetheless, it's recommended to reference specific creatures or elements of the game to gain more accurate information.