Reborn After Death: My Villain Wife Destroyed the World for Me

I transmigrated into a nobody—not the hero, not even a proper villain. Fine. I'll aim higher by clinging to the real villain's coattails. Years pass, and somehow I've become the den mother of every major antagonist in this world. Worse yet, one particular 'little villain' insists on becoming my wife. Just when life starts looking up, a twisted system forces my heroic sacrifice. I thought she'd move on and thrive... but I was dead wrong. The day I died, blood rained from the heavens. Cradling my corpse, she obliterated the protagonist's entire group and plunged the world into darkness.