|Objective:||Exploit the Time-Wound, learn Dragonrend & defeat Alduin.|
|Location(s):||Throat of the World|
|Next Quest:||The Fallen|
Read the Elder Scroll at the Throat of the World.
Learn how to use the Dragonrend shout.
Note: A big boss fight is coming up, so you should take time to prepare. Stock up on potions and make sure you save.
With the Elder Scroll in hand, fast travel to Throat of the World. Paarthurnax will greet you and applaud your conviction. Go to the Time-Wound and stand in the midst of it, then open your inventory and read the Elder Scroll...
Watch the scenes that transpire and you will learn all three words of Dragonrend: Mortal, Finite, Temporary... After the scenes you'll be back in your own time with Alduin the World-Eater right in front of you! Equip your new shout and bring him down.
Fighting Alduin is quite a bit different than fighting any other dragon. For one, he never comes down voluntarily... never. And the entire time that you're fighting him fireballs will be raining down with rocks scattering everywhere. Thankfully these attacks don't do much damage. While Alduin is flying around, he will be sparring with Paarthurnax, frankly making it much harder to know which dragon to target (Alduin looks much more menacing and the objective arrow will constantly follow him. Plus, if you have a companion, you can see who they are targeting...).
The saving grace in this fight is that every now and again Alduin will stop and hover somewhere (because hitting him with Dragonrend when he's flying is frickin' hard), so use those times to get him. He'll crash land, but he's still extremely dangerous. He's not very mobile when he's on the ground, so be sure to attack from the sides if you can. Keep it up and remember to heal yourself first and foremost and with time you'll have defeated Alduin.
Watch the scenes that follow once his HP reaches 0 and then the quest Alduin's Bane will be finished and your next new main quest: The Fallen will begin...