Minecraft Dungeons:Phantom

A phantom is a hostile mob that appears at Night when a hero dies in multiplayer.

Spawning
Phantoms are summoned only when a hero dies in multiplayer. Unlike their default counterparts, phantoms are immune to all attacks and can be stopped only by reviving all defeated heroes and ending the night status.

Behavior
Unlike their default counterparts, phantoms swoop to heroes vertically instead of horizontally. They first start with one hero, then groups of them swoop on other heroes until all heroes are killed, or until the night ends due to all killed heroes being revived. The first bite deals 8% of the player's HP, 10% for the 2nd bite, 12% for the 3rd, and so on and the damage keeps increasing over time.

Trivia

 * The attack and flying behavior of phantoms in Dungeons is similar various species of hawks in reality instead of the original game, which used the Ender dragon's behavior.