An alien parasite has latched onto ROVE and is crawling all over your modules. You’ll need to figure out how to deal with this new challenge in order to complete your mission. ROVE: Crawler is a single Module card expansion. Crawler is a new module that adds a neat little twist to the game: It has a new restriction (it must always cover a single module), it’s own ability and movement, and a special sort of passive ability. It's sometimes in your way and sometimes useful.