The thing is, as a cleric of Mystra you get the options like any other cleric also. I speak from experience. There is not much special about a Cleric of Mystra with Gale. I played as cleric of Mystra and then cleric of Tymora. And with wizard levels on the letter even. It feels like Larian didn't do their homework about Mystra. They just threw the cleric and wizard options randomly in one pot and put a Cleric of Mystra tag on it: :P
I feel that could be done better. Shadowheart for example gets special dialogues if you encounter her as a cleric of Selune. So why didn't they guve really special dialogues if you encounter Gale as a cleric of Mystra.
The test of faith thing was easy for me, since i was romancing Gale in that play through, i chose to defy Mystra, not lead my lover into his certain death and everyone else with us. But i miss reactions from Mystra. She could punish the cleric for it as well. I mean, Larian is so proud of the consequences of the game. Why not also put consequnces for the player here.


Fun fact, he is still the only companion that didn't get a new kiss animation. Everyone else did by now.

Also some of the end dialogues sseem still linked wrong and buggy. Even walking the Forgiveness path caused him to become a god even if i didn't want that. I tried to get an ending as possible for everyone of my companions and that's what you get for Gale? They should seriously give him a rework on those parts and a throrough testing. He doesn't deserve to be treated that sloppy.