Use "Area Terrain" like forests, craters, or toxic swamps to create movement penalties. These areas often provide "Dense Cover," making units harder to hit (-1 to hit rolls) because the foliage disrupts the attacker's aim. The Fortress Walls
Valerius stood atop a rusted . Below him, his Intercessors used the thick conduits as Light Cover , ducking behind the iron curves to avoid incoming splinter fire. warhammer-40k-terrain-ideas
Suddenly, the ground beneath the marshals' feet shimmered. They had wandered into a patch of —a "Woods" or "Area Terrain" feature. The thick, alien vines slowed the Orks' charge, forcing them to subtract 2 inches from their movement. Use "Area Terrain" like forests, craters, or toxic