After Breaking Off My Marriage, I Became A Powerful Minister's Treasure - Chapter 20 - There were some problems with the medicine

Ian was an ordinary guy on his way to work when he suddenly found himself in a strange and dangerous world ruled by dark races like vampires, werewolves, and demons. Transmigrated into the body of a lesser vampire, Ian must quickly adapt to his new reality where survival is a constant struggle.Just when all hope seems lost, Ian discovers he has a unique advantage: The Strongest Body Customization System, which allows him to modify and customize his body by consuming biomass. With this golden finger, Ian starts to turn the tables, designing bone claws and other enhancements to give him an edge against the terrifying werewolves and other supernatural threats.But as Ian learns more about the Curtained Imperium and the rigid hierarchies of the vampire race, he realizes that defeating his enemies is only the first step. To survive and thrive in this dark and brutal world, Ian must rise through the ranks, uncover the power of his system.Need to fly? Customize a pair of angel wings!The body is small? Add hundreds meters of height and become bigger than Godzilla!Need a weapon? Customize bone claws and kagune on the spot!

I am not that good with synopsis, So please read the first chapter instead.

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After accidentally killing the male lead and changing the course of the story, our Demon Queen finds herself in a very complex situation.

As the final villainess of this world, her mission was to be defeated while making the Chosen Ones stronger.

But fate played a cruel trick on her.

Left with no other choice, she finds herself forced to serve the Female lead to survive.

As the story unfolds, our Demon Queen must navigate her new life as the heroine's servant while also trying to uncover the truth behind her sudden change in fate.

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This is the story of a modern sailor who was accidentally reborn as a soldier of the Brazilian Expeditionary Force, and finally became the largest plutocratic family in Brazil by virtue of his foresight.

- Description from novelbuddy

I was the Pope.I had ten years to save the world from destruction.I came close to death many times, saved the world, and finally returned to Earth…[Warning! If you do not reach the target number of believers within 90 days, your system will be reset!]“…Excuse me?”“What?”“…I’ve come to tell you about the good news of our Lord.”