Castle of Black Iron - Chapter 1919 - Unimaginable!

The low-ranking behemoth, the iron mountain is invincible in the horizontal push, and it is called the king of the backing.

- Description from novelbuddy

When a boy in a medieval fantasy world wakes up with the memories of his past life, he discovers a secret buried deep within his mind—a highly advanced AI companion. This AI, a relic of his previous existence, holds the knowledge of a futuristic world filled with technology, science, and innovation.Armed with this unprecedented advantage, the boy embarks on an extraordinary journey to transform his medieval surroundings into a thriving futuristic utopia. From reinventing agriculture to creating advanced cities, he introduces ideas far beyond the comprehension of his peers. But his vision isn't without challenges—power-hungry nobles, skeptical commoners, and ancient magical forces stand in his way.

Zavier met Cosmic Consciousness after his death. He was satisfied with every system that Cosmic Consciousness exhibited, so he wanted all of them. Surprisingly, the Cosmic Consciousness obliged him.

Zavier was reborn in an isekai full of magic and alchemy. Now, he had many routes to upgrade. Interestingly, to coordinate these systems, Cosmic Consciousness gave him the gift of being able to duplicate himself. He could clone a finite number of himself to manipulate these systems.

Magus, Alchemist, Mesmer, Tamer, Hunter, Vampire, Werewolf, Dragonknight, Necromancer.....

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By the way, it wouldn't appear NTR or some bullshit harem of courtships. MC of course will have harem but not for cliches.

Freyah Lima knew death all too well, but waking up five hours before the apocalypse gave her a second chance. Armed with memories of the past, she races against time to prepare. Yet, when she reaches her parking lot, she finds something-or someone-that shouldn't exist.A man stands there: silver hair, ragged clothes, and a translucent screen hovering above his head.[Florence PlaridelRole: Third Male Lead of the Novel PrimroseAbility: Healing and SwordmanshipFate: Unknown]Florence Plaridel-the half blood third prince, the unrequited lover, a skilled healer and swordsman from the last novel Freyah read before her death. In Primrose, he managed to escape before his execution due to treason, then said his farewell to the female lead, telling her he won't bother her anymore. After that, nothing was mentioned anymore about him.But now he's here. In her world. On the eve of its destruction.Freyah doesn't know how or why a fictional character has appeared, but one thing is certain: the apocalypse will rewrite the world, and Florence's unexplained presence could change everything.As survival becomes a race against fate, Freyah must decide: is Florence the key to saving this world, or a sign that its ending has already begun?The forgotten prince has returned-and with him, the rules of fate are no longer absolute.