Echoes of the Lost Timeline

The Chrono Core is a crystalline temporal energy matrix created by the ancient Chronos Civilization over 10,000 years ago. It can manipulate time, space, biological evolution, and dimensional barriers. The Void Legion is a galaxy-spanning empire ruled by Emperor Oblivion, who exists outside the normal flow of time. The Legion has three specialized divisions: the Ground Division (Underground Core — subterranean monsters and curse-based warriors targeting Zero), the Sky Division (Lord Void's fortress-army — tactical generals and monster armies targeting the Sentai team), and the Star Division (alien invaders — space fleets and bio-weapons targeting Galaxy Sheriff X and Earth's orbital defenses). The Chrono Core created three distinct transformation systems as a failsafe: the Rider System (individual evolution armor — DNA-bonded, forms based on user's inner element), the Sentai System (team-based harmonic resonance — five users linked by color frequencies), and the Metal System (high-tech