Universe At War- Earth Assault -

The Hierarchy does not build structures. Instead, they deploy —massive, four-legged war machines that act as mobile bases. Your "Construction Yard" is a giant robot that can stomp enemy tanks. You can upgrade these Walkers with different modules (air defense, artillery, infantry production). If a Walker is destroyed, your entire tech tree walks with it. This creates high-risk, high-reward positioning that you won’t find anywhere else.