The Exorcist - Chapter 9Book 7: : Portrait

However, he did not know that he was not raising just a harmless pet, but a biological weapon secretly made by the government… a real monster.

As a former librarian, Rand felt that he had been living an ordinary life, the one that he had reclaimed unconsciously every single day.

Recently, he has been a little upset because the pet fish he accidently brought home to raised seems to have undergo some strange changes

Well, it turned into a merman.

- Description from Novelupdates

The World of Immortals, it is the world every mortal long for. For many, it is an eternal glory to cause a spatial distortion and enter the World of Immortals. But the vicissitude of time is simply merciless, the legends regarding immortality had long been forgotten.

"So, that's how my life ends, what a waste of time it was...".
These were the last thoughts of a young man, shot by accident in a fight between local gangs. Little did he know that he would soon wake up in another world, a world of cultivation!
This is the story of the whoreson of a wealthy family, of a transmigrator that had no purpose in his previous life, of a demon that will make power his reason to keep on living.
Noah Balvan, after he transmigrated, will have to fight against his social status and the many difficulties of the world he was reborn in to obtain the power to stand free in the sky above anyone!

In 'Only Wisdom Awakened,' the world bears the arrival of monstrous threats and the emergence of awakened individuals wielding extraordinary powers.Hans Richter, a young man burdened by the weight of debt he had to take to cover up his family's medical expenses, inherits the 'UNKNOWN' class {Knowledge Seeker} on the somber night of his eighteenth birthday.Unlike his peers, Hans's abilities stem from his relentless pursuit of knowledge, and his boundless imagination, unaffected by the limits set by the 'system' for others.As Hans navigates this perilous world, he grapples with moral dilemmas and confronts formidable adversaries, driven by his longing to once again see his loved ones and unveil the truth behind the catastrophic events that reshaped his world.