Dungeon of Pride, Laplace - Chapter 3: Demon Baron

It was an enormous tsunami that completely covered the sky, and due to its dark water, the sun had been blocked out. A sense of despair ran through everybody as they looked towards the peaked wave quickly crashing down. But was I the only one who noticed the massive sea monster lurking towards the front of the wave? CRASH [Requirments Met] [System has been chosen] [Your god has been selected] [System Granted] [Poseidon System is being installed]

Reborn into the Marvel world and become the son of the boss Jin Bing, what about the prince of the underground forces?

Don’t panic, the Black Shadow Corps provides the most loyal subordinates!

Twelve spells give you extraordinary power!

The eight demons will let you master the supernatural powers of overturning rivers and seas!

If you want to challenge, line up and come one by one!

- Description from novelbuddy

Cui Heng was transmigrated to another world and the system told him that the new world he was in was a high-grade Xianxia world.

In a realm of four kingdoms, two were on the verge of war. Prince Eirik, the fourth prince of Valeidio, a Ferre whose beauty could rival the gods, was thrust into a marriage alliance with Prince Kaelix, the strong and proud heir of Zephyros.Both princes were determined to fight against the fate that had been forced on them. Eirik resented being used as a pawn, while Kaelix saw the alliance as a threat to his freedom. As they clashed in a battle of wills, their encounters became a constant push and pull of resistance and pride.But as the pressures of duty mounted, the lines between obligation and desire began to blur. In their struggle against their forced union, they found themselves drawn toward each other in ways they never expected.Would their bond become a weapon against the war or would their kingdoms' rivalries destroy any chance of love before it could take root?