Cloud Sanctuary

Cloud Sanctuary is the sixth and final area in Sonic Boom: Shattered Crystal. It is a giant floating island fortress, reminiscent of an ancient city, and the headquarters of Lyric the Last Ancient and his armies. After kidnapping Amy, Lyric brought her here to extract her archaeological knowledge. However, Team Sonic eventually saved Amy and stopped Lyric once and for all.

Air Fortress
The front of this level takes place on some floating ruins above the clouds with pink skies while the back takes place just outside Lyric's airship. It becomes available after obtaining about twenty-four Sonic Badges.

Worm Tunnel
The Worm Tunnel is a racing course where the player must reach the end of an obstacle course while dealing with Driller Worms. It becomes available after clearing Air Fortress and obtaining twenty-seven Sonic Badges.

Lyric's Airship
In Lyric's Airship, the player faces the game's final boss, Lyric the Last Ancient. Here, Sonic must follow Lyric through an obstacle course and beat him at three different points to win. It becomes available after clearing Air Fortress and obtaining thirty Sonic Badges.

Q-N-C's Toy Shop
This building is the local shop owned by Q-N-C. Here, the player can trade Tokens for toys and display their current collection. It becomes available after clearing Air Fortress.

Trivia

 * This level shares similarities with the Sky Citadel in Sonic Boom: Rise of Lyric.