Players can save many NPCs in Baldur's Gate 3 with relatively little actual cost. Oftentimes, it just involves succeeding on a few skill checks or attacking nearby enemies. However, there are a few times when the NPC in danger requires a very specific type of assistance that can be extremely rare or expensive.
Baldur's Gate 3: How To Save Thulla
A Deep Gnome named Thulla has been poisoned and sadly appears to need one of the rarest items in Baldur's Gate 3 to cure herself.