SiNiSistar 2 has a hidden Staurotheca route, and in this guide, I’ll show you exactly how I found it and unlocked the related achievement.
How to Find Staurotheca
To find the Staurotheca in SiNiSistar 2, you need to reach Arcezon Cathedral and use the hidden elevator route inside the library. In this short guide, I explain the exact steps I followed to reach the Staurotheca and unlock the related achievement.
Go to Arcezon Cathedral

First, I went to Arcezon Cathedral. Before looking for the Staurotheca, I made sure that Arcezon Cathedral was already unlocked on the east side of the map.
Enter the Library
Once I was inside Arcezon Cathedral, I continued walking toward the back of the large room and went through the door.

After passing through it, I reached the library.
Find the Elevator
Inside the library, I kept moving toward the back area again. There, I found an elevator.

Use the Elevator Trick
Finally, I activated the elevator so it would start going up. As soon as it began moving, I went left and fell off the elevator.
After the elevator left without me, I jumped into the hole on the right. This is the path I followed to reach the Staurotheca and unlock the related achievement.

