Survival for All in Another World

The premise: everyone in the world transmigrates to another realm and must fight to survive. The protagonist gets a System that can amplify anything a hundredfold. Any supplies he obtains can be increased a hundredfold. There are also natives in the other realm.

The System’s rules: any resources obtained or seized can be amplified a hundredfold, but purchased resources cannot. Recruited soldiers can be amplified.

The protagonist is a little less normal than most people.

The general plot: steady growth in the early stages, violent plunder in the middle, and expanding his power in the later stages.