In the later parts of Dragon Quest 7: Reimagined, you are going to encounter a location in the game called “The Grand Conjuratorium”. This location cannot be missed in the game as it is part of the main story. I will not spoil why you come here, but I will take you through how to open the blue door outside the church. Below will be a quick and easy guide to getting it open!
How to Open the Blue Door in the Grand Conjuratorium in Dragon Quest 7: Reimagined
Go inside the church to start a puzzle. The game will not explain explicitly how to solve it, but the hint that is given is cryptic. It will tell you to make a cross with the statue involved pretty obvious, but what does this mean? Well, you will have to go to the archway that the statue is standing near, then cross over to the other end, and then take the corner upward through the upper archway all the way down. This will activate a small bridge to use the staircase in the middle, and that will take you out through the Blue Door outside. Below will be an image showing the order in which you will need to run through.

It’s a clever little puzzle, albeit very poorly explained in religious terms. But this will be how you open the Blue Door in the Grand Conjuratorium in Dragon Quest 7: Reimagined. The chamber within has some good treasures, including a tablet fragment!
The credit for this puzzle solution is owed to an answer from GameFAQs in 2016.
I hope this helped you, dear reader.
