Larian Studios Forums Baldur's Gate III Baldur's Gate III - Story & Character Discussion Shadowheart Romance and the Hidden Fetish - (Spoilers inside)

Wanting to be primary partner is exactly why she should accept Karlach...pragmatism in knowing Karlach will die off in a few weeks anyway.

Shadowheart wouldn't let the player follow Karlach to Avernus, but any fate less than that she should in theory be fine with. It's like taking a very temporary concubine.