Board Thread:Questions and Answers/@comment-35366685-20180710162053/@comment-27837351-20180710162516

The post-credits scene in Age of Ultron takes place during the Infinity War, with Thanos retrieving the Infinity Gauntlet from Nidavellir, the home of the Dwarves (confirmed by Joe Russo). Also, Thanos said "Fine, I'll do it myself."