Minecraft Dungeons:Phantom

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

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

Behavior
Unlike their default counterparts, phantoms swoop to heroes vertically instead of horizontally, but will first start with one hero then groups of them will swoop 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.
 * Phantoms are the first and only mob that are immune to all attacks.