I'm in the Three Cave of the Cunning Rabbit in the Wilderness

Xin Yun traveled through ancient times, The human race is weak, the lich is tyrannical, and a catastrophe is about to begin. Use the mechanical engineering knowledge from the previous life to make elixirs and weapons, I still need to hug my thighs, farm and manage, and the cunning rabbit has three burrows! In this way, there should be no need to worry, right?