The virtual game of Nightmare Lord

The Nightmare Lord intends to use all creatures on the planet as dream nourishment.
But the protagonist told him that virtual games are more promising.
In the past, human beings were afraid to avoid the dream world,
But now, a bunch of players are yelling when the Nightmare World will be updated, and their big swords are already hungry and thirsty!
When more and more players entered this virtual world, one player suddenly discovered that the items in the nightmare world could be taken to the...