There, again, is one of my points. Let's just rip things off like a bandaid. Let me have the ability to roll to determine if I know anything about Shar and/or if Shadowheart is lying. Let me call her on it. Let's just get it out of the way. Don't drag it out like it's some huge surprise and have my character super shocked when they "discover" the truth from her. In fact, give me various chances to call her on it. Like the whole owlbear cave Selune statue thing. Let me call her on it. "Why are you SO against Selune? She's a good goddess, you know. Come to think of it. You're a cleric of trickery domain. Right? Who do you serve again?"
If it would be well handles it could be the best way to proceed. I think of Disco Elysium and how what your character knows, perceives and thinks is determined by his stats and rolls, not by players knowledge/perception. Of course, like in DE the narrator would need to bring player up to speed - so if you PC recognises symbol of selune, the narrator should give player info on who that is.
That would be an abitious way of doing things, though, and Larian invested themselves in other reactivities.
