I think it would be a toss-up between: Killing Mikrul skirmish-style with my bow without taking a single hit from that blade (LOVE those Quick Shot and Ranger perks from Archery).Restoring the Thieves' Guild to prominence again and reaping the rewards of becoming the new Guild Master.The first time that I fought and killed two dragons at once. The first dragon was a regular dragon, but partway through, a Blood Dragon joined the battle. There was also a Cave Bear involved as well. Lydia and I had the fight of our lives that day on that mountain in the Reach. The Blood Dragon went down first, then the regular dragon, with the bear being taken down last as a loose end. When it was all over, I was left saying "holy s#*!" over and over again.Kicking Alduin's ass in Sovngarde. The final sequence of the main storyline is pure win all around, and it felt damn good to avenge everyone from Helgen and save the world.