From the Monte Cook Games website: The 100-card Numenera Intrusion Deck presents scores of potential GM intrusions. Time to throw a wrench into the player’s carefully crafted plans? Just draw a card—or draw three or four and pick one that works best. You can even use the deck when prepping adventures, to help inspire the intrusions you plan for the encounters you design. The cards are color-coded for combat, interaction, and miscellaneous encounters—just draw the card type that matches the type of scene being played.