by In Trinity Trigger, there are a total of 10 blue treasure chests that contain beast keys. Below are the locations of these blue treasure chests.
1. Woodroost
This chest can be found in the northeastern corner of town.
To reach it, you’ll need to enter the trees to the east of the residence that is just south of the shop. From there, continue north, passing a chest until you reach the blue chest.
2. Astrum Forest Trail: South
In the center of the Astrum Forest Trail: South, you’ll find a wooden bridge. Cross under this bridge heading north and go up the wooden stairs. On the left side you’ll notice two rows of mushrooms.
Head through them, passing underneath the stone pathway then follow the path to reach the blue chest.
3. Hoplard Mountains: South
In this area, make your way to the spot shown in the picture below.
Use Fists to break the rock (might need to progress further into the story until you unlock this ability). Wait a bit then a bridge of ice will form. Hop on the bridge and head west to reach the blue chest on the other side of the river.
4. Desert Tombs
Head to the fast moving sand pit just north of the oasis in the Desert Tombs and purposely fall in!
In this area, you’ll spot 4 chests clumped together to the northwest.
They are all mimics! Take them out to cause the blue chest to spawn. Open it to reveal the Beast Key!
5. Urbantheria: Wharf
This chest will spawn on the east side of the area during the Guardian of Stahl main quest after you beat Noire and need to report back to Gris.
6. Stahl Plains: South
To get this blue chest to spawn, cut the grass by the trees in the north central part of the area. You can come to this conclusion by following the golden birds that fly from tree to tree. You’ll discover this chest at the end of their path.
7. Festibane Trail: West
In order to get this blue chest to spawn, you must destroy EVERYTHING on this map… enemies, flowers, logs, crystals, rocks and crates!
Once you do, the chest will spawn along the wooded path in the north at the green marker shown in the map above.
8. Oread Mountain
This chest can be found off the beaten path. Start here…
then follow the arrows to reach the chest down a long and windy not to mention narrow path!
9. Grimgreed
After completing the 32. Maiden of the Marsh side quest, speak with the Junkmonger in Grimgreed then agree to pay 100,000 liba. As a reward, the chest will spawn.
10. Desperacia
Speak with Gabriel on the northwestern side of town. As a reward, he’ll spawn this chest!
