The origin of the Red Line is linked to the brutality that took place during the Void Century.
THIS is what really happened in the Empty Century!
After about 1100+ chapters and episodes, One Piece has finally started to reveal the mysteries and riddles that Eiichiro Oda has been hiding for so long. Dr. Vegapunk's broadcast announcement marked the beginning of this revelation, and finally fans have some answers as to what Oda planned to do with his magnum opus in the first place.
One such mystery that has received some answers and attention was the Void Century. It is a time period in One Piece's history that has no archaeological evidence in existence but still holds great significance in the story. While there are still a lot of things left to unravel about the Void Century, one thing that can be said for sure is the violence that took place during that time.
Many aspects of Dr. Vegapunk's broadcast talks about the not-so-ideal situation during the conflict between the World Government and the Ancient Kingdom, which incidentally led to the creation of the Void Century. This violence and destruction are also the main reasons behind the creation of the red line.
