Baldur's Gate 3 is filled with choices that not only matter, but will alter every choice that players can make from that point on. One of the big choices in Act 2 is all about helping Shadowheart through the Trials of Shar.
Baldur's Gate 3: Should You Save or Kill Nightsong?
The Nightsong quest is part of Shadowheart's quest chain in Act 2, and players can either choose to kill her or get Shadowheart to keep her alive.
