The Divine Ten

There are 10 Gods known in the history of Grand Gaia. These ten known as the Divine Ten because they possess more power than other gods (say, like Luther or Phee.). Four of them were disappeared when the Great War happened. The 6 remaining gods in the story are :

1. Holy Emperor Karna Masta (disciple : Feeva)
He is the God that Meirith had sworn to protect at all costs, as well as worshipping Him. Ishgrian Demons, according to Mora, addressed Him as the God of Chaos (hence Feeva's titles : Misfortune Feeva, Devastation Queen Feeva, then Cataclysm Empress Feeva). One day, He announced that humans must be exterminated because they are nothing more than a greedy race. Lucius then sealed Him in "the land forsaken by the gods", but not before Karna Masta used His curse to the humanity: the power to summon the heroes from the past and force those spirits to battle the gods.
As He landed in Ishgria, he went rampage and destroyed the lands in Ishgria, forcing the Demon Lords who resides in the realm to fought Him. But they couldn't defeat Him. At that time, Lucius' disiple came and taught them how to use Empty Seal, which then they used to seal Karna Masta in a land called Menon. The Demon Lords of Ishgria then acted as the guard of the seal, along with Merodo, who then resided in Wulgee and suffered from the poisonous miasma there.

2.  Lucius, the God of Gate (disciples : Merodo, Tilith, Ark)
Lucius is the one who guides the player through Grand Gaia, up until Atharva, before player defeat Him in Bariura. When Karna Masta announced the plan to exterminate humans, Lucius opposed His idea, then He sent the Priestess who worshipped Him, the Oracle Shaman, to defeat Karna Masta. The Oracle Shaman then went with her boyfriend, who is also the wielder of the title Oracle Knight, along with some other companions (Ruby, Medina, Rinon, Yuura, Dion), and her brother (Balgran) to defeat Karna Masta, but then Merodo captured the Oracle Shaman and sealed her away in Ishgria, along with the Holy Emperor. Merodo then used this to manipulate the Oracle Knight to kill the Six Heroes, who were the last hope of humanity.
After the Great War, Tilith was born with the power to manipulate the Gate, which then raised by Lucius himself to inherit His duty. He also assign Tilith to guide the Summoner Player to defeat Four Fallen Gods. Lucius actually wanted to become the only ruler of the worlds, and this explains why He banished Karna Masta to Ishgria. He actually wanted to destroy Karna Masta's curse because it could be dangerous for Him, but He saw the threat of the Four Fallen Gods as a bigger problem, so He sent the Summoner Player to defeat the Four Fallen Gods first.
Known as a kind god at first, Lucius is actually a cunning god too. He ordered Merodo to sealed the Oracle Shaman, and He also the one who lured the Six Pillars (Feeva, Tora, Kanon, Alpha, Tazer, and Kira) to the barrier He created in Celgrad and asked them to kill each other before He defeated the sole survivor. Feeva could see through this plan, so she waited until Lucius appeared to destroy them before she attacked Him with full force.

3. Creator Maxwell (disciple : Kanon)
Long time ago, Maxwell was betrayed and severely injured by Her own disciple, Kanon. Maxwell was the creator of the world, and wielded the power to create things from scratch. Maxwell is the first boss the player needs to defeat, despite wielding such power. Perhaps, Her power hasn't fully regenerated after the Great War because She exhausted most of Her power to defeat the Summoners who tried to contain Her. Furthermore, it's also possible that She hasn't fully recovered yet during the War thanks to Kanon's rebellion.
During Her time in Mistral region, She made a machinized gurardian, Juggernaut, to guard the Tower of Mistral, and has Abaddon to guard the Tower of Morgan. Abaddon introduced himself as Her disciple to Graham, but there is another theory that Abaddon is actually a demon who masked itself as a disciple.

4. Cardes the Malevolent (disciples : Zebra and Tora)
Cardes is presumably a God who ruled the Underworld, as well as the Commander during the Great War. He intended to invade Palmyna archipelago, along with his disciple, Zebra, and his "partners in crime", Luther and Phee. The First Princess of Palmyna Kingdom then journeyed to defeat Cardes, and she managed to seal Cardes along with herself in the place called "Spirit World". Long after that, while suffering memory loss that locked away His power, He has to accept the defeat once again in Summoner Player's hand.
Long before the War, He had another disciple, but then He banished her to Ishgria after Zebra told Him a fake story where she refused to be involved in a wicked ritual Cardes was about to perform. The disciple, Tora, was then banished to Ishgria afterwards.

5. Zevalhua the Supreme (disciples : Mare and Alpha)
 In Grand Gaia, Zevalhua resides in Agni Region, in the Tower of God in Mirvana. Zevalhua and Afla Dilith shared hostile relationship since they want to rule over the other's territory. Zevalhua was aware with Lucius' plan, but she couldn't face the Summoner Player with full power since She needs to prepare for a counter-attack with Afla Dilith. Known as a cunning Goddess just like Mare, She would do anything to lure Her opponents into Her trap. Meanwhile, Alpha, Her first disciple, was known as the man who prefers a fair-and-square fights. Unfortunately, during Alpha's match with Zevalhua, Mare injured Apha badly, forcing Alpha to retreat and then Lucius lured him to the barrier.

6. Beast God Afla Dilith (disciple : Zurg)
Afla Dilith has the power to assimilate things He has eaten to himself. This is why Tazer once chased Him, because Afla Dilith ate Tazer's friend. But, Tazer suffered a terrible loss, then Zurg helped him to runaway before Lucius lured him to enter the barrier. Afla Dilith knew Lucius' plan to become the sole ruler of the world, and thus He rebelled against Lucius and descended to Vriksha region. Lucius then sent the summoner player to defeat Him, along with the rest of "Fallen Gods" who resided in Grand Gaia.

7. Mythic Kulyuk (disciples : Averus, Zeal, Layla)

Kulyuk was one of the highest rank God in Divine Ten. Unlike the other gods, though, He saw humans just like He saw other beings, as equal thing. He judged and loved every creatures equally. Unfortunately, the other gods who wanted the extermination of humanity couldn't agree with Him. One day, Karna Masta called Kulyuk. Afterwards, the whereabouts of Him is unknown.

8. El Felice (disciples : Sherry, Soleil, Pamela, Lala, Mazelca)
El Felice was known as a benevolent goddess who loves humans. Because of this, humans deeply worshipped Her. She was especially respected by womenkind. Before the Great War, though, She perished after Her favorite disciple attacked Her.