You have a small portable space.
While storms rage outside, icy winds howl, and zombies swarm, you can relax, play, and eat hot pot inside.
While the world outside is treacherous and full of schemes and gunfire, you can hide inside and take potshots.
When everyone else is short on food and clothing, you've already gathered experts from across the heavens and myriad realms and started a factory in your portable space.
What's more, as you travel from world to world, your little space takes the origin of each realm and expands exponentially, until it becomes a world of its own.
