Upon approaching the two groups, the party will be drawn into the conflict. Farlin will ask for help fighting the Stone Lord's men, promising that the Guild will pay. If the player agrees to help, they will join the Guild in a fight against the Stone Lord's men. If they decline, try to appeal to Cairos, or try to prevent either side from fighting then both factions will turn hostile.
The party can also wait nearby for the fight to begin, and then join or wait for it to end.
If the party chooses to side with Farlin, then she will put in a good word for them with Tusgront who guards the entrance to The Guild. He will let the party inside without requiring a dialogue check.
Speak with Dead
If Farlin is killed, she can be spoken to using Speak with Dead. She will explain that she was sent from the Guild to seize the Stone Lord's haul for Nine-Fingers, though they did not know what it was besides being a valuable item.
Deal extra damage to a foe you have Advantage against. Also works if you have an ally within 1.5 m / 5 ft of the target and you don't have Disadvantage.