Minecraft Dungeons:Wraith

Wraiths are undead hostile mobs found in certain levels $$. The Wretched Wraith is another variant of the Wraith found in the Creeping Winter DLC.

Spawning
The Wraith can naturally be found in the Highblock Halls, the Underhalls, the Desert Temple, the Lower Temple, the Creeper Woods and the Creepy Crypt. It can also sometimes be summoned by Necromancers, and by the Wretched Wraith. It can also be found in an ambush in a secret castle like place in the Frosted Fjord.

Behavior
The Wraith attacks the player by creating areas of scorching blue flames on the ground that burn the player and cause significant damage over time.

Stunning the Wraith while it is attacking allows the player to cancel its attack.

The Wraith can teleport away from Players and their own path of flames to avoid taking damage.

Trivia

 * The blue flames the wraith summons appear to be soul fire. Minecraft Dungeons was announced, and in development, quite some time before the Nether Update and soul fire were announced, however.
 * Some of the sounds resemble that of a ghast from the base game.