Undead: Dominate All Living Beings

In a world as small as sand in the universe, the world is wrapped in a force. At first glance, it is just nothingness. No one knows what is inside, and no one knows why it is like this. They only know ancient rumors that when the seal is broken, it is the beginning of world turmoil. It's the first time a newbie is writing a book, so I'm asking for advice. It's the first time a newbie is writing a book, so I'm asking for advice. It's the first time a newbie is writing a book, so I'm asking for advice. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.