As Wilf watches the storm, at home with Sylvia and Donna, the strange woman appears again.
It didn't count until she could see it for what it was. See God beneath every face and every detail and every part of the world and the universe. The sun and the moon. And eventually back down to Earth. But even still, she never thought it would end. It doesn't. We forget because we must.
"As it was written in the Secret Books of Saxon, these are the Potions of Life..." They combine their magic potions and the ring, everything, while Lucy screams in horror. Finally, they wipe her mouth: Like Donna and her coffee every morning, she became his vessel without ever knowing it. "You were Saxon's wife. You bore his imprint. That's all we needed, the final biometrical signature..." It's a kiss, on a napkin; they drop it into the mortar and the spell begins: Lightning, and a mad vortex above their heads. The ring, the potions, and the kiss. Everything reversed. The women of the cult begin to drop like flies, their souls taken up into the oncoming storm like so many archangel voices. They call on him, by his true name, and he appears, naked and beautiful, whirling above them.
"Never. Never. Never. Never. Never dying. Never dying! Never dying! Never dying! Never dying!"
The TARDIS goes mad on her way to stop him, shooting sparks and dropping wires. The Master laughs, and holds out his arms to his wife. "Did the widow's kiss bring me back to life?" He watches the cult fall, dying one by one, and laughs down at poor Lucy: "They're just the first. The whole stupid stinking human disgrace can fall into the pit." The drums return, louder than ever before, as he clutches at his head. "Oh, I have missed them!" he laughs. Like Donna was, once: Lonely and in love with what makes him lonely, offering only clemency without redemption. Lucy stands up, suddenly, smiling.
"But no one knew you better than I did. I knew you'd come back. And all this time, your disciples have prepared -- but so have we!" One of her guards hands her a tiny vial. "The Secret Books of Saxon spoke of the Potions of Life. And I was never that bright, but my family had contacts, people who were clever enough to calculate the opposite." As he screams, she uncorks the little bottle, and hurls the mess into the cauldron. "Till death do us part, Harry!" Begging for obedience, he explodes in the light.