X4: Merlin, formally known as X Tournament Series: Chapter 4 and codenamed Merlin, was the nineteenth tournament in the X Tournament Series and the fourth tournament in the 2016 season. The tournament was organized and operated on 30 April 2016 by Doqtor Kirby. X4 was seeded using version 3.1 of the X Scoring System. X4: Merlin featured a Brawl Minus event as well.