Killed Paarthurnax.
Dragons and mortals can never coexist peacefully forever, and to protect the lives of the current and future generations, dragonkin has to go.
Paarthurnax has more than earned his forgiveness for saving the world twice, but he's still a dragon, still a
dovah.
With Alduin gone, his threat level finally overlapses that of his usefulness.
It's not fun having to put down a friend like that, even though it's necessary
