Hoodoo's - a fantastic name given to equally fantastic rock formations - perfect for your Antarean battlefield!
Hoodoos are tall skinny spires of rock that protrude from the bottom of arid basins and "broken" lands. Hoodoos are most commonly found in the High Plateaus region of the Colorado Plateau and in the Badlands regions of the Northern Great Plains. While hoodoos are scattered throughout these areas, nowhere in the world are they as abundant as in the northern section of Bryce Canyon National Park Utah
Of course we're not in Utah but in the 7th Age of man as we explore the Antarean universe - These Hoodoo's lend themselves to landscapes on far distant worlds - maybe a desert or let your imagination run wild to ancient civilisations building homes among the formations, Hoodoos crashed to the ground leaving rough & broken terrain, overgrown with dense forest/jungle.