When you first go to Hollow Bastion you start off in a waterfall area. If you jump up 5-6 platforms from where you start you will see a cut-scene. You will first see Riku talking to the Beast from Beauty and the Beast and then he will talk to Sora. Riku will then steal your keyblade(which you get back at the end of Hollow Bastion)and Donald and Goofy sadly go with Riku since they must follow the keyblade bearer. After this all you are left with is a wooden sword and the Beast in your party. Also,after this cut-scene you can no longer use the gummi ship and will not be able to use it until Donald and Goofy are back in your party at the end of the Hollow Bastion level. This is bad for anyone who planned on leaving Hollow Bastion to level up or to find any hidden secrets on other worlds (such as the Neverland clocktower items)because with just a wooden sword fighting is going to be very hard. Another bad thing is that Hollow Bastion is one of the longest levels in Kingdom Hearts and it also has some very hard Heartless, making it very hard to survive. The only good thing is that the Beast is an amazing fighter and he will do most of the fighting in Hollow Bastion since all you have is a wooden sword which does absolutely no damage when fighting. So remember, if you want to level up or find any secrets from other worlds I reccomend that you do it before you go to Hollow Bastion because it should make it a lot easier to get through the level. And if you skipped this from what I wrote before you will get the keyblade back at the end of the level so don't worry.