Diablo 2 Walkthrough -> Act 5
Quest 1 - Siege On Harrogath
Baal demons have laid siege to Harrogath. If you want to earn the trust of Larzuk and the rest of the besieged city, stop the demons' catapults—they're about to collapse the walls around you. This quest can be obtained from Larzuk or by setting foot on the besieged grounds.
Hint: If you see a wooden bridge leading to the Frigid Highlands, you've gone too far. Look for a clearing in Bloody Foothills surrounded by several squads of minions.
Quest 2 - Rescue on Mount Arreat
The siege has been lifted, and now all of Qual-Kehk's thoughts have turned to his subjects, who are in the demons' custody. God only knows what they're doing to them... As you climb Mount Arreat, keep your eyes peeled for Qual-Kehk's soldiers; and if you find them, try to bring them back. This quest can be obtained from Qual-Kehk or by entering the soldiers' area:
Hint: Search all the locks you find in abundance to locate special points on the map. They will be marked in white. Break open the doors and free the Barbarians.
Quest 3 - Prison of Ice
Anya, a young alchemist and the daughter of one of the slain elders, has disappeared. A strong and skilled young woman, her spirit is unmatched and unwavering. The night before your arrival, Malah saw Anya arguing heatedly with Nihlathak. The next morning, she was gone.
Nilatak has told everyone his version of what might have happened, but Mala fears he's hiding something—something Anya knows. Find Anya and return her to Garrogath. If anything happens to Nilatak, she'll know what to do. This quest can be obtained from Mala or by entering Anya's area in the Ice Caves.
Quest 4 - Betrayal of Harrogath!
Nilatak decided to make a deal with Baal to protect his hometown. He would give Baal a sacred relic of the Elders, which would allow anyone to ascend the mountain unhindered. Anya tried to stop Nilatak, but he trapped her in the Horde. Someone must stop Nilatak before he dooms us all. Even a half-delirious state would not justify his horrific actions:
Anya longs to strangle him herself, but she's still too weak after her imprisonment. You must kill him. It's the only way to stop him before he destroys everything we've spent so long defending, sword in hand. You'll receive this quest from Anya.
Hint: Find the Halls of Vaught.
Quest 5 - Rite of Passage
You climb higher and higher up the mountain. No mortal would dare climb here. For the locals, this place is sacred, especially since legend has it that the mountain is guarded by the Ancients. They will not let the unworthy pass.
It doesn't matter what Qual-Kek and the rest of the townspeople think of you now. The elders will decide whether you're ready for such a battle. Good luck. This quest can be obtained from Qual-Kek or by climbing to the mountain's summit.
Hint: All three Elders must be destroyed without leaving the mountaintop, otherwise they will re-materialize. You will not be able to complete this quest if your character's difficulty level is below 20, where Normal is 1, Nightmare is 2, and Hell is 3.
Quest 6 - Eve of Destruction
Beware. Open the mountain's gates, and you will find yourself face to face with Baal, the Lord of Destruction—he awaits you within. Tyrael has always protected us, but now even he is powerless. Baal has barred the entrance to the Worldstone Chamber from spiritual beings. Only you, a mortal, can defeat him. By threatening the Worldstone, Baal threatens the entire world:
You must stop Baal before it's too late. If he gains control of the Worldstone, everything will be over. You'll receive this quest from the Elders.
Hint: Find the Throne of Destruction. Kill all the monsters in Baal's Throne Room. Then go to the Worldstone Chamber and fight Baal.
See also:
Half-Life 2 Speedrun
A complete walkthrough of Half-Life 2