Freeing the Beast
Speak with Beast after the scene and you will be tossed into combat against some Nobodies; a new enemy called a Dragoon. After the battle you are in the Ballroom so head out to the Entrance Hall and over to the West Hall. At the steps you can leap with High Jump Lv2 and Aerial Dodge to reach Dawn #43 .
Monster - Dragoon
Dragoons fight like Xaldin but have a major weakness in that you can use the Reaction Command "Learn" to unleash Jump on them and deal a lot of damage.
Enter Beast’s Room for a quick scene. Head back into Beast’s Room and talk to him. You’ll receive the Rumbling Rose Keyblade and Castle Walls Map after the scene. There is also the Absent Silhouette for Marluxia in this room now. Back at the Entrance Hall you’ll have to fight off more Dragoons. Head to the Courtyard for a scene and the start off the boss fight.
BOSS - Xaldin
Xaldin wields lances just like Dragoons but he uses six of them at a time. The thing you need to know the most is that when Xaldin lunges with his lances you can use the "Learn" Reaction Command. Mash it a few times and you should accumulate a few uses; it tops off at nine. This allows you to use Jump which deals significant damage and sets Xaldin up to be attacked with a vicious aerial combo.
In regards to his attacks, Xaldin uses lunges and slashes that are easy to Dodge Roll or Quick Run to avoid leaving himself open for a counter or his Reaction Command. While in the air Xaldin will use Wind Blast or a Lightning Zap that can be Reflected. As the battle draws to a close, Xaldin unleashes his most furious attack, Dragon Ride. Xaldin rides around on his lances and unleashes a huge beam across the bridge. Use Jump at this point to avoid damage and start a combo, preferably a few Jumps should be used at this point to close out the battle.
Rewards : HP +5 (Sora), Reflect Element (Sora), Auto Healing (Donald), HP +5 (Goofy), HP +25 (Beast)
After the battle you receive Secret Ansem’s Report 4. If you didn’t grab it during the battle, head back to the Bridge and snag Twilight #28 . This opens up the path back to Olympus Coliseum.