Design a background image that channels the grim and powerful atmosphere of Warhammer Fantasy cover art from the 80s and 90s. The image should be devoid of main characters but rich in elements that suggest strength and resilience, such as rugged landscapes, dark skies, and symbolic representations like shackles. This background should resonate with the bodybuilding and gym community, embodying themes of overcoming challenges. Use a color scheme and artistic techniques reminiscent of the era's art style, focusing on creating a setting that could be the backdrop for epic tales of struggle and triumph.