Shadowheart is one of the main characters in Baldur's Gate 3 that you can have in your party. While she is in your party, you will have to make numerous choices that will further shape the story. Since players want to know the consequences of their choice before they proceed, they are vexed about whether or not to let Shadowheart become a Dark Justiciar in BG3. This guide is all you need to make a choice for yourself.
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With almost every character, you will have to make a number of different choices that will help you move the story forward in the direction of those choices. Therefore, it is important to know the consequences of the choices you would like to make. Since players are afraid of losing Shadowheart, they are confused about whether or not to let her be the Dark Justiciar in Baldur's Gate 3.
If Shadowheart wants to become a Dark Justiciar in Baldur's Gate 3, she'll need to kill Nightsong in Act 2 of the game. However, the consequences of killing Nightsong are much worse than not killing her. Additionally, if you want to woo Shadowheart, you wouldn't want her to become a Dark Justiciar, as she'll now fully embrace being one of Shar's chosen.
If that wasn’t enough, you should also know that everyone dies in Last Light, which means you might be depriving yourself of some useful quests. So if you were to ask me if you should let Shadowheart become a Dark Justiciar in BG3, the answer would be no. The consequences far outweigh the benefits.