Depending on the choice you've made with the Sharran cleric Shadowheart in Baldur's Gate 3, the main questline Daughter of Darkness can have some very different conclusions. In Act 3, you'll find the House of Grief one way or another, and Shadowheart's future lies inside.
Baldur's Gate 3: House of Grief Walkthrough
The House of Grief holds major character choices for Shadowheart in Baldur's Gate 3 and can be different depending on your Nightsong choice in act 2.