Minecraft Dungeons:Phantom

The Phantom is an enemy-like mechanic that appears at night.

Night is a game state similar to night the Minecraft base game, but it only occurs when one or more players are defeated in co-op multiplayer. When any number of players are defeated, the remaining players will see a countdown near their utility bar showing when the night will begin to damage them. When the timer expires, phantoms will begin to swoop down and attack any living players until defeated players have been received, ending the night. Unlike the Minecraft mob, the phantom is immune to all attacks and can only be stopped by reviving all defeated players and ending the night status.