Walkthrough:Kingdom Hearts: Chain of Memories/ArchAngelus/Part 14

AA:*Ahem* Ladies and Gentleman, Prepare for...

Producer: Eh, AA...Who did you call?

AA: Ronan, the Abyss Knight!

Ronan: For the Glory of Canaban! Why did you called me right now?

AA: I need some help...Let's start!

Event: Icy Ambush
AA: When you get back to Castle Oblivion from Hollow Bastion, a member of Organization XIII will be waiting for you.

Producer: *Cahem* It's Vexen, who, as suspected by Sora, is making Riku evil.

Ronan: Let's try! There is little conversation before the time for battle comes.

Director: My turn!

AA: Once you've defeated Vexen, he'll escape and the scene will switch to Organization members Larxene, Axel, and Marluxia having a conversation. The discussion seems to be about Vexen. Once this cutscene is done, go up the stairs to see a new world - Twilight Town.