Reborn in the prehistoric world, open the invincible sub-leader system. Instruct Tongtian to become a sage, become the deputy leader of the Jiejiao at the beginning, send the killing gun, and have millions of merits! Suppress thousands of prehistoric beasts, develop the Jiejiao, and be admired by thousands of immortals, becoming the greatest force in the prehistoric !Golden Immortal? Taiyi Golden Immortal? !