Gaiden 9: "The Men of the depths"

"The God has asked a question... and I have answered: "I am Seadragon"

A gorgeous full-color 4-page spread of Kanon wearing the General Sea Dragon Scale with the other 6 Scales and Poseidon’s cloth in the background. It simply repeats the scene when Kanon first discovered Poseidon's trident and Palace.

Chapter 30: "The Ones who stand in the way"
Shura, wounded after the battle with Crios, & Aiolia feel the dark presence of Cronos at Sanctuary. Aiolia supports Shura as they return to Sanctuary.
Cronos has retrieved the Megas Drepanon from beneath the statue of Athena but finds there are 2 seals that block his path. Grand Pope Saga is there as well and says that the 2nd seal was placed by Zeus because of how he feared the Cronos’ return. Saga himself will release the seals so that he can offer the MD to Cronos. He also says that all Saints are under his orders to not interfere.
The 5 Gold Saints who are at sanctuary (Death Mask, Shaka, Camus, Milo and Aphrodite) are under orders to protect their own houses. Milo is furious that he is stuck there while Cronos is at Sancturary, while Camus is suspicious that the enemy would attack at this exact moment. Aphordite suspects a traitor is among them. Shaka believes that only the 2 Gold Saints who didn’t receive the Grand Pope’s orders (Shura & Aiolia) could stop Cronos, but someone else needs to buy time before they get there.
Back at Athena’s statue, Cronos mocks the lack of Saints at Sanctuary to stop him. Saga internally begins to struggle with that notion, and Saga’s light side emerges. Removing the Pope’s cloths, Saga summons the Gemini gold cloth and prepares to fight Cronos as the Gold Saint of Gemini.
Despite “Light” Saga’s worries about the time he has left, he still fights on, using Another Dimension on Cronos. Cronos resists and uses Teleos Oracle to try to revert Saga to the dark side, but at that moment Saga goes Galaxian Explosion on Cronos and …Boom :D

Some Raws here.

Chapter 31: “The One who is Imprisoned”
As the clouds of the explosion fade away, we see that both Cronos and Saga survived. Cronos used the cosmos inherent to Athena’s statue to protect himself, while Saga used the defensive barrier that Zeus’ seal on MD produces. It would seem that the seal reacts to any aggressive attack by creating a barrier.
Cronos attacks again, but with an attack that takes away life, Hyetos Kaos. The barrier doesn't react to this, so Saga is slowly being drained of his life. He once again uses Another Dimension.
Cronos mocks Saga, saying that his cosmos is infinite compared to "Light" Saga's limited time. Suddenly Saga attacks again and in shock, Cronos realizes he is losing his Ichor, his divine blood, even though he is just a spiritual form. He demands Saga to tell him what he has done. Saga reveals the Gold Dagger (oddly enough it’s as big as a sword here) that Cronos gave to him 6 years ago to assassinate Athena. Saga says that he is ready to commit the greatest sin by using a forbidden weapon to kill Cronos. He prepares to deliver the final blow.
But unfortunately, “Light” Saga’s consciousness fades and he falls to the floor. Taking the Pope’s cloths and mask, “Dark” Saga teleports back to the throne room. As he recovers, he curses his other side and shouts that he hates himself.
Cronos senses another cosmos approaching. With great speed, Aiolia has passed all the 12 houses (and left Shura at the house of Capricorn) to arrive in front of Athena’s statue. Cronos recognizes him as the one who will release the seals. Aiolia doesn’t agree with Cronos and attacks with Lightning Bolt. Cronos anticipated this and uses the MD to catch Aiolia's attack. It results with the destruction of the “fake MD”: The true Megas Drepanon is shown, with Cronos’ true body sealed with of Zeus’ lightning.

Raw pictures here.