Artificial Famine

This ritual conjured through Sith magic was effective against a whole planet or moon. The caster summoned the forces of the winds and corrupted its molecules with the dark side, thus making the winds turn black. Since the winds were usually always present in the higher layers of the atmosphere, they would make the whole sky dark, completely blacking out the sun for the inhabitants of the intended planet, causing most of the planet's population to die from freezing and hunger. This effect could only be reversed by another powerful Force user.