Larian Studios Forums Baldur's Gate III Baldur's Gate III - Story & Character Discussion Question about Shadowheart romance *spoilers*

You can continue to have a relationship with Shadowheart if your approval is high enough, regardless of what happens to the Nightsong.

Of course, if the Nightsong dies then it's going to be under different terms because she's still a hardcore follower of Shar.

For the record, letting Shadowheart decide in my run made her spare the Nightsong. Thus I believe it's mainly based on your approval.