Worldbuilding at megavani scale carries a specific ethical burden. The more detailed the invented world, the greater the temptation to fetishize difference: to exoticize cultures, to annotate suffering as aesthetic texture, or to indulge in totalizing myths about progress and decline. Responsible large-scale fiction resists this by remembering contingency: institutions and beliefs are products of choices, chance, and violence. It interrogates origin stories instead of celebrating them, foregrounds marginal perspectives instead of allowing a single grand narrative to absorb every fate, and treats technological or planetary systems as morally ambiguous forces shaped by human intention.