Ah well, I just ended up killing the goblin leaders with a bit of meta-knowledge from my previous playthroughs of the area, didn't take too long it just felt weird doing it when I could have (and should have if I were hard roleplaying) taken the more direct path to the mountain pass.

Thanks for replying, it's a shame there's no alternative character to fix Karlach's heart, as it's a lot of work keeping these suicidal tieflings alive! :lol:

They have so many other NPCs in the game with unique replacements, seems odd there isn't another blacksmith (or the diabolist, or the gondians) who could help.