A raiding party has invaded the Cisterns and it is up to you to defeat the enemy captain Kamabhosh and his lieutenants.
'The Withered Tree has let a raiding party of Orcs into the Cisterns, led by Uruk-hai. I heard them shout orders from within the tunnels and if we don't act, they will reach the city proper. They must be dealt with at once.'
Kamabhosh and his lieutenants can be found in the Cisterns.
You should find and defeat Kamabhosh and his lieutenants.