Catastrophic World: the System Forces Me to Be the Savior

"The star core processor said it would save civilization? OK! But it didn't say which one it would save!" Chen Feng, who traveled through time and became an experimental subject, held a nano-machine that could reorganize matter in his left hand, and held up a star core crystal that could convert energy in his right hand. He looked at the three competing races in front of him—— Elves: Purifying the ecology is the right way! Goblins: Technological evolution is the future! Giants: Only by protecting history can we be reborn! And the star civilization in the sky is sneering: I asked you to take refuge in me, but you want to overthrow me? Chen Feng gnawed on the mutant beast's thigh and suddenly found that the star core processor on his chest was getting hot. He looked at the star core processor that was only one fragment away from being fully awakened... "Everyone, I have a bold idea - how about we use the enemy's civilization as a battery?" (System prompt: Warning! It is recommended to start the symbiotic defense protocol immediately, otherwise the dimensional annihilation program may be triggered...)