"The Spectre" by ThirdOfFive
"The Spectre" is a 100% vanilla multiplayer minigame made in the latest snapshot. In the game, one player is randomly selected to be "the Spectre", while the rest are "Survivors"; and are then placed in an enclosed default world. During the day, the survivors play, build, and explore, as they normally would in default survival; while the Spectre hides away in a cave, weakened. At night, however, the Spectre gains special powers (which grow with each passing night), with which to hunt down the survivors. The goal of the Spectre is to kill all survivors, and the goal of the survivors is to kill the Spectre.
Recommended for 5-20 players.