Safe and Sound
The events in Hollow Bastion cause the gang to take refuge in Traverse Town. After talking with Leon and the gang, head to the First District and speak to Cid. He’ll know what to do with the Navi-G Pieces you’ve been collecting along your journeys. Head out to the Secret Waterway and talk to Kairi. Approach the mural on the wall to receive a Navi-Gummi. Return to Kairi to trigger a cutscene, after which you’ll receive the Oathkeeper Keyblade. Before you leave, activate the White Trinity to reveal a Treasure Chest.
A Few Quick Stops
Before you head back out to the World Map, it’s probably a good idea to stop by the Magician’s Study and speak with the Fairy Godmother. She’ll convert your Fireglow into the Mushu Summon Spell. This should be your last summon, in which case, the Fairy Godmother will also hand over the Lord Fortune for Donald.
Speak to Merlin next. Having acquired all seven basic types of magic, he’ll hand over the Spellbinder for Sora. If by chance you’ve done a little Mushroom Hunting outside the main story, you might have acquired all seven Spell Arts from the White Mushrooms. If you have, Merlin will also hand over the Dream Shield for Goofy. Later, when you acquire all of the highest-tier magic, he’ll also hand over Donald’s Dream Rod.
Outside, you can now activate the Yellow Trinity nearby to reach a Treasure Chest on the roof. You can also use the Glide ability to reach the small island with another Treasure Chest on it.
You also might want to stop by the Accessory Shop and buy some new Accessories for your party. There are a bunch of new weapons for Donald and Goofy at the Item Shop too.
Once you’ve made all of the stops you want, head back to Cid. He’ll install the new Navi-Gummi so you can go back to Hollow Bastion, but there’s a catch. You’ll have to return to Hollow Bastion all over again as if you’ve never been there before, which includes replaying the Gummi Ship sequence. You can use the Warp Hole that appears next to Traverse Town on the World Map to reach Hollow Bastion even faster.