|Species:|| Celestial Guardian |
|Weapon:||Vixedin Sword (Complete) (Zweihander Sword)|
|Appearances:||Omega VI: Revelations|
| Azazel |
Xemgao (Unknown - 0 AΩX), is the grandfather of the Omega Series. Xemgao's appearance was kept secret for many years. He serves as the final boss of Omega VI: Revelations which is where he also makes his debut.
Xemgao also has an alter ego, OmegaX, a human form he took after the falldown.
Afer regaining his powers and his memories, Xemgao was killed by Tera Shinryu.
As OmegaX, Xemgao impregnated a mortal Filgaian woman, for almost three millennia his bloodline continues to live on, in the year 2862 AΩX, Xemgao has two living descendants.
- The Forgotten One, son.
- Hauser Blackwell, grandson.
- Wolfsbane Atma, descendant.
- Siegfried Atma, descendant.
- Beowulf Atma, descendant.
- Logan Atma, descendant.
- Lorna Atma, descendant.
- Scythe, descendant.