The End of the World: I Have a System That Can Transform Energy

In the apocalyptic category, there are martial arts, natural disasters in the early stage, mutated lizard men, and mutant beasts running rampant, followed by various disasters and alien space creatures. The protagonist relies on the energy conversion system to survive. He is not nervous, a bit Buddhist and bland. The protagonist feels safe, invincible, and refuses to be bullied! The introduction is weak, so those who fall into the trap need to be careful.