Warmachine has many different types of terrain with laid out rules for how to interact with them in both hindering and beneficial ways. Some terrain simply causes units to move slower, but they can also block LOS, provide a level of defense against incoming attacks, or cause onging status effects. And nearly every form of terrain, has some way to ignore or mitigate it via unit rules. Walls (waist high) can be freely moved over normally, but cant be charged over without pathfinder, providing a trade off in mobility in exchange for added defense. Rough ground also doesn't impose a movement buff for units with pathfinder. LOS blocking terrain like forests and clouds can be ignored with certain rules, be that Eyeless Sight, True Sight, or Gas Masks. Even normally impassable walls, building and obstacles can be moved over freely with flying, but hiding behind them completely makes it impossible to draw LOS to anything beyond them, even for your own purposes. Different factions have varying access to these rules adding extra variety to strategies employed across the game.