Destroy the cache of explosives.
Heavens no! Poor Rustlocke. 'Tis quite a tragedy indeed.
We must not let his death pass in vain. This parchment you discovered indicates that Kam Deepfury, the mastermind behind the original attack, arranged for a cache of explosives to be stashed just across the Thandol Span, in Arathi Highlands.
If those explosives make it to the bridge, our major supply line to the north will be severed! The cache must be destroyed, [player]! Return to me when your mission is complete.
You're our only hope.