The Seven Phantoms

The year was 2531 when Humanity established themselves across the galaxy creating an era of peace and harmony, a golden age if you would call it that, with Earth's nations united to form Unity "together we are a new bright future for all", not long into Unity's rain came the Democratic peoples of Cyberia, with first contact successful with trade alliance, Military alliance and even inviting and welcoming the Democratic peoples of Cyberia into Unity.
The year was 2631, Unity, and the Cyberian's are celebrating their 100th anniversary where the leaders of both sides give a toast. The Unity President was poisoned by an Unknown spy in order to take down Unity; however the plan failed as Federal forces arrived, found and executed the Murderer, sparking the now called the infinite war.
The current year is 3219 Unity is a the brink of collapse and have been at war with what is now the Cyberian Empire for 588 years with no chance of ending anytime soon, however There are seven individuals who can stop the fighting and bring a new era of peace, they are only known as Phantoms as who becomes a Phantom stays a Phantom as reincarnation takes place every 1000 years and now they are coming back, but who are these mysterious seven?