Alduin's Bane

Walkthrough
Once the Dragonborn has acquired the Dragon Elder Scroll, return to the Throat of the World where the time-wound is found.

Read the Elder Scroll at the Time-Wound
Once standing inside of the time-wound, the Elder Scroll must be read and this will transport the Dragonborn into a dream sequence of the past where the battle between the three Nord heroes, Hakon One-Eye, Gormlaith Golden-Hilt and Felldir the Old and Alduin can be witnessed.

Learn the "Dragonrend" Shout from the Nord heroes
During the battle, Felldir will finally resort to using Dragonrend to send the dragon forward in time, letting the Dragonborn learn the shout (all three words). This also ends the dream sequence.

Defeat Alduin
Once back in the present, Alduin appears and must be defeated.

Using the Dragonrend and some powerful weapons Alduin quickly is defeated, only to flee the battlefield, to places unknown.

Alduins Fluch