The quest starts as soon as you pick up the Elder Scroll during the previous quest named, Elder Knowledge. Alduin’s Bane must be completed in order to finish the second act of the game and advance to the third and final act.
The following Elder Scrolls V: Skyrim walkthrough explain how to finish Alduin’s Bane, revealing useful tips, tricks and hints that can help those who have reached this part.
Additionally, the walkthrough reveals all side-quests adjacent to Alduin’s Bane and all points of interest and areas that must be visited by fans of the game.
Unlike the previous quest, Alduin’s Bane is shorter and there are only three objectives that must be completed and three areas that must be visited: Throat of the World, Tower of Mzark and the Oculory.
The first objective of the quest appears as soon as you find the Elder Scroll.
Objective 1: Read the Elder Scroll at the Time-Wound
Leave the Tower of Mzark and make sure you use the correct elevator. To reach the surface you must take the elevator at the end of the corridor under the balcony (where the console is located).
Travel to the Throat of the World where Paarthurnax is waiting for you.
Approach the Time-Wound (the glowing area), open your inventory and read the Scroll to receive a new objective.
Objective 2: Learn the Dragonrend Shout from the Nord heroes
As soon as you finish reading the scroll, a cutscene starts and you will be teleported to the past where three Nord heroes fight Alduin. They are Gormlaith, Hakon, and Felldir.
Pay attention to the dialogue between them and you will hear three words, which form the Dragonrend Shout: Joor (Mortal), Zah (Finite) and Frul (Temporary).
You will learn the new shout and Alduin will be banished, however keep in mind that this is the past. Stay alert because you will receive the third objective, when you return to the present.
Objective 3: Defeat Alduin
Watch Alduin appearing through the blizzard and get ready to fight him.
Paarthurnax will try to intercept him, but unfortunately, he wont succeed.
You will hear Paarthurnax telling you to use the Dragonrend Shout.
How to defeat Alduin
As soon as you hear Paarthurnax, select the Dragonrend Shout and aim it at Alduin.
You can hold the button pressed until you have a clear shot, and then release it.
Alduin will descend from the sky and he will land near you.
Keep in mind that you cant hurt him with a normal attack while he is flying.
As soon as Alduin lands, use the most powerful attack you have, including another Shout, magic, ranged or melee attack.
When he takes off, select the Dragonrend Shout and take him down again.
The fight against Alduin consists in repetitive phases, and it will end only when Alduins health bar empties.
Dont forget to use the potions you have in your inventory, otherwise, you may not survive.
When Alduin falls, you will complete the quest, and the second act.