After the Monster's Strange Resurgence, I Rebuilt My Practice System

(Revival of spiritual energy + the protagonist is invincible all the way + thousands of races fighting for hegemony + the system and the old man + a grand world view, perfect benchmarking) Monsters and monsters emerge one after another, the glory of the past has long faded, and the past cultivation systems of all races have been severed. The human race, which suppressed all races, also fell, and most of the people at the bottom were reduced to blood food. An ordinary time traveler, Lin Ming, came to this hopeless world after traveling through time. Demons were rampant and strange resurgences occurred. Fortunately, he had the system and a portable grandfather to give him warmth. Step by step, he becomes stronger, rebuilds the cultivation system, and conquers all races again. When he is about to reach the top, he discovers that there is a shocking conspiracy surrounding him. What is the mystery? Why time travel? Who is behind the system? Who is that creature standing at the end of time? What is the curse that pervades the entire length of time, space and destiny? Why did the ancestral home of the human race collapse? Where are those taboo giants? What are you planning? Do we still have a future?