I am the Cataclysm!

Traveling through the game world, Deya became a wizard of the necromancy school, also known as a 'necromancer', who was good at digging up people's ancestral graves.
The bad news: this game is a patchwork.
Good news: All sewn!
Deya, who is familiar with the plot, knows that in a few years his family will be destroyed by the invasion of the enemy country and the betrayal of the king.
In order to avoid this outcome, Deya made a decision that went against his ancestors:
Waging war, inciting the people, plotting rebellion, deceiving the church, embezzling the kingdom's property, and executing the king's entire family...
If it fails, then it will be the 'scourge of the undead'!
Deya: "I have committed countless crimes in my life."
The undead army will overwhelm everything, and this land will eventually fall into war and death!
And I am a natural disaster!
……
A witch with the power of 'return from death', a resurrected doll girl, a princess corrupted by an alien god, and a 'strange object' that wields mysterious power.