Destroy the Dragonmaw catapults.
While you were fighting the Dragonmaws, we discovered more of their plans.
You need to take out those catapults. They're in the Dragonmaw encampment.
Here, take this tinder. Fight your way to the catapults and light them with the tinder.
And after you've done that, find and kill Nek'rosh. We need to cut this Dragonmaw beast down...at its neck.
The first catapult is before you. Will you set it aflame?
You place some of the tinder on the catapult then strike a spark onto it. Flame erupts and quickly spreads!