Dragonrend is a Dragon Shout in the game The Elder Scrolls V: Skyrim
You learn Dragonrend in the quest Alduin's Bane with the help of Paarthurnax
Level 1 - 10
Level 2 - 12
Level 3 - 15
Your Voice lashes out at a dragon's very soul, forcing the beast to land
You then use it to defeat Alduin in the Throat of the World and in Sovngarde.
"Joor" - Mortal