Fushi-Ou wa Slow Life o Kibou Shimasu

After being reincarnated, Sigmund awakens in a new world as a weak ghost. Fleeing from monsters, he takes refuge in a nearby cave, where he gradually levels up. To his surprise, Sigmund eventually evolves into the mighty "Immortal King." With the expansive forest as his base, he now aims to gather followers, craft golems, and create a self-sustaining life. However, no matter how powerful he becomes, trouble seems to be waiting around every turn...