Vagrant Secret Source Dragon Idol guide for Genshin Impact 5.5. Read about Secret Source Dragon at south island, how to defeat, & Shadow of the Colossi achievement.
Table of Contents
Starting Location Of Vagrant Secret Source Dragon
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The vagrant Secret Source Dragon Idol can be found in the small island at the south within the Atocpan region. When you activate the switch in front of the statue, it will move and a challenge will start.
How To Get To The South Island?

Go to the area just north of the southern island. A Secret Source Dragon Idol puzzle will be encountered.

Using an indwelled Tatankasaur, use its dash ability to ram into the protruding parts. Once three (3) parts are destroyed, the Dragon Idol will stop moving.

When you open the chest on top of its head, it will begin to move towards the southern island. Be careful to not fall into the water while its moving!

Once you arrive on the island, head deeper after unlocking the waypoint.

On top of a circular stone platform, you'll be able to see the vagrant Secret Source Dragon Idol with a light wall and locked Luxurious Chest. Activating the Switch in front of it will start a challenge.
Vagrant Secret Source Dragon - How To Defeat
Avoid Obstacles And Moving Light Sensors

▲ Obstacles encountered in the maze
The first challenge will be a maze where bomb-like obstacles are scattered throughout. Change the in-game time to night so you can see the light sensors and avoid them.
Light Sensors For Attacking The Secret Source Dragon Idol
The second challenge is activated once you reach the end of the maze. Use the light sensors to trigger the Secret Source Dragon Cannons at the walls of arena.
Tatankasaur Dash Can Be Used To Hit The Boss
Since the only way to deal damage to the Secret Source Dragon Idol is through hitting the Dragon Cannons on its body, you can use Varesa or Iansan to deal damage to it.
Vagrant Secret Source Dragon - Rewards
Shadow of the Colossi Achievement

After defeating the vagrant Secret Source Dragon Idol at the South Island, Travelers can unlock the "Shadow of the Colossi" achievement!
Unlocks The Luxurious Chest

The locked Luxurious Chest from earlier is now unlocked! Since this chest is within the Atocpan region, you also have a chance to obtain a Sunset-Blue Obsidian Fragment.
Sunset-Blue Obsidian Fragment Guide