Gutter Runners are skilled at infiltrating behind enemy lines, scouting ahead of the main Skaven force and hiding in a position that will allow them to jump out at the right moment to ambush the crew of enemy war machines, or to cut down wizards or enemy officers. Sometimes these stealthy fighters use the tunnels that make up the labyrinthine Skaven Under-Empire to make an unexpected attack on vulberable rear of an enemy force.