MTL - A Wizard’s Secret - Chapter 984 Doomsday blood slaughter (below)

This novel is also known as Almighty Video Game Designer

Chen Mo a game designer got sent to a parallel world with advance technology but undeveloped game concepts.

Watch as he redefines the world’s gaming industry with the games he remade from his old world.

- Description from Novelupdates

Once upon a time, the Devil fell in love with one of the King’s many wives. One night he went to her room disguised as her husband and made love to her. She got pregnant with his child. Knowing this The King ordered her execution believing his wife cheated on him, but then the Devil appeared to the king making him a deal. In exchange for great power for his Kingdom, the King will let his wife Sire The Devil’s Child. The King who was greedy for power agrees to the deal and his Kingdom becomes one of the most powerful Kingdoms and the Devil’s Child, the seventh Prince of the Kingdom.

Choi Sunwoo’s life takes a dramatic turn when he wakes up as a character in the very novel that enthralled him for weeks. Working as a publishing company PD for five years, Sunwoo is no stranger to dramatic twists, but nothing prepares him for this surreal twist of fate. Now pregnant and trapped in a cursed narrative, he becomes an integral part of the story he once read. Sunwoo’s character, an ambitious Omega, daringly infiltrates the secretariat under the guise of a Beta, all to be near the enigmatic and dominant Alpha, Kang Jinwook. His bold plan spirals out of control, leading to a scandalous pregnancy and a botched blackmail scheme. As he attempts to extricate himself from this tangled web by resigning, he finds himself the focus of Jinwook’s intense and obsessive desires. Will he outwit Jinwook and break free from the novel’s grip, or will he be forever ensnared in its pages?