The Minecraft Phantom is a flitting hostile mob that preys on those who have spent three in-game days without sleeping for three days. You can spot them from far away by their green eyes So be ready.
The trail of puffy grey smoke that a Minecraft phantom leaves behind is the trail of puffy smoke. It can be observed in creative mode, since it doesn't strike. If struck by an enchanted sword by smite or injured by the instant damage effect the Minecraft phantom takes additional damage. However, they're immune to poison and can reverse the effects of instant damage potions.
They attack by swooping downwards, and they don't stay at a single spot for long. This makes it difficult to strike a good hit with your bow. The best method to defeat the phantom is to use a sword. You can also send your tamed Wolf. If all else fails, the ghost isn't one of the cats, and will usually stay about 16 blocks away from cats - it will flee if your feline is tamed.
Minecraft phantom creating
There is a difference in the way Phantoms appear in Java and Bedrock editions. The official Minecraft Wiki has more details.
Java editon: Minecraft phantoms can spawn in the Overworld during nighttime or during thunderstorms. They will always spawn over you, making it difficult to avoid these ominous creatures. If you're suffering from insomnia and have gone three or more days without sleep, be prepared to hear the hollow cries of a phantom as it covers the sky over you. To make matters worse Phantoms are more likely to reproduce the longer you've been able to sleep.
To create a Phantom, you must be at at sea level and not have any obstructions overhead that block light. In order to allow the phantom to appear in Minecraft, it must be located below the phantom's two-foot light limit. You can expect to hear the squeak and flapping wings of 1-6 Phantoms. They will spawn between 20-34 blocks higher than you.
Minecraft phantom summoning
You can summon a phantom from Java edition by using a Minecraft cheat. This requires you to allow cheats in the world. You can summon a phantom from any Minecraft world using the chat window and '/summon command' If you do not want Phantoms appearing at all it is necessary to set the doInsomnia game rule to false.
Of course, you'll need to change the time of day to night, otherwise the phantom will spawn on fire, just like any undead mob in Minecraft.
Phantom loot in Minecraft
You can easily earn rewards if you kill the Phantom. Minecraft phantoms drop valuable items, and XP.
Phantom membranes 0-1 - 5 experience orbs
If you're interested in what Minecraft membranes can be used for, they could be used to make Minecraft potions, such as the Potion of Slow Falling. You'll require an brewing stand, bottles of water, and blaze dust. Minecraft phantom membranes can also be used to repair Broken Elytras.