I remember watching this. Valak was a figure that probably terrified many people. Haha. The actor who aged Sister Irene (forgot her name) really did well.

In the end, the Nun reminded me that evil may test your faith, but it should never make you lose it. When you hold firmly to God, even in the darkest moments, you can find the courage to face what scares you most.

Yes, that's a very important message to take from the movie. And Sister Irene showed that. Nice review!