Global Survival in the Great Famine: Did I Get a God-Tier Start?

[Everyone enters a world of famine. When everything in the game becomes reality, Jiang Lin realizes things aren't as simple as he'd imagined...]

[Survival will be difficult for the protagonist in the early stages. This isn't a power fantasy, so please don't complain if that's not your thing.]

Background: In the early days of the Eternal Realm, there were two extraordinarily powerful civilizations: one understood the wisdom of the moon, while the other wielded the power of shadow.

The civilization that understood lunar wisdom was the first to fathom the power of gemstones. Using that power, they created rainbow gems to provide energy for their civilization.

They then left the place where they had lived alongside the shadows and built a small city called the Ancient Archives.

They grew stronger and stronger, and eventually their civilization reached its zenith.

Using rainbow gems, they left this place, bringing an end to the war between the two civilizations that had fought for a thousand years.

The shadow civilization was never able to master more powerful technology, but it too built a glorious civilization called the Ancient Civilization.

They ruled the underground world. Desperate for power, the people of the Ancient Civilization tried every possible way to grow stronger. Then one day, a crack opened between the ancient world and reality. The creatures of the shadow world sought to use the people of the real world to become more powerful.

Using the power of shadow, they drew countless humans into the Eternal Realm, but no one ever managed to reach the Ancient Civilization underground... until Jiang Lin appeared...