Cult of the Damned is chapter 4 of the Warcraft III: Reign of Chaos human campaign, The Scourge of Lordaeron. It begins with Arthas and Jaina watching a group of acolytes build a gold mine. Arthas and Jaina killed some of the acolytes, but the rest escaped. They build their base and begin attacking an undead base. They reached Andorhal, only to find that Kel'Thuzad has already infected the granary with the Plague, and sent out the grain shipments. Kel'Thuzad leaves, but not before mocking Arthas and Jaina, and commanding his undead minions to kill them, but Arthas and Jaina managed to destroy the granary anyway. Arthas and Jaina pursued Kel'Thuzad, killed his undead guards, and then slew Kel'Thuzad himself. Before dying he told them that Mal'Ganis is in Stratholme, and he will spread the plague of undeath there.
This mission does not require either constructing a base or making soldiers.The best way to complete this mission is to cast Divine Shield on Arthas as you enter the Undead camp.Keep moving until you reach Andorhal.Then, the cutscene will occur.Destroy the granaries and the ghouls Kel'Thuzad had,then (optional) free Timmy and get your reward.Continue to advance, and you should come across two ghouls.Cast Holy Light on one,and then kill him, then do the same with the other one.As you enter Kel'Thuzad's throne,guarded by abominations, once again cast Divine Shield, move forward to Kel Thuzad and kill him.The process should take about 10 minutes.