What is a phantom?
A phantom is a flying undead mob that hunts you when you have gone too long without sleeping. If you have ever been mining for days, surfaced at night, and heard a high screech before something dove at your head, that was a phantom.
Phantoms were added in version 1.13, the Update Aquatic. They are the only mob that spawns based on your own behavior rather than the time of day or the light around you. Skip enough nights in a bed and the game starts sending them after you.
They also drop the only renewable source of phantom membrane, which repairs an elytra and brews slow falling potions. So while they are a nuisance, they are worth farming once you understand how they work.
In the air a phantom looks like a flat, gray-blue creature with two wide wings and a pair of green-glowing eyes. The eyes pulse brighter as it lines up a dive, which is a small visual tell you can use. They are smaller than they sound, but a group moving together at night can be hard to track against a dark sky.
What makes phantoms spawn
The game tracks how long it has been since you last slept or died. This hidden counter is called insomnia. Once you have gone three full in-game days without sleeping, phantoms can start to appear at night.
The spawn conditions are specific. You need to be in the Overworld, it has to be night, and you have to be standing somewhere with open sky above you at roughly sea level or higher (around Y 64 and up). Phantoms then appear in groups of one to four, materializing high in the air above you.
Once they spawn, they circle overhead, then peel off one at a time and swoop down to bite. After a pass they climb back up and line up for another dive. The pattern is predictable, which is good, because it gives you a window to hit them.
Because the trigger is your own sleep habit rather than darkness, you can be standing in a perfectly well-lit base and still get attacked. Torches and lanterns do nothing to stop a phantom. The only light that matters to them is the sun, which kills them, and even that only helps once morning arrives.
How phantoms behave in a group
Phantoms almost never come alone once your insomnia is high. A pack will stagger its dives so that as one climbs away, the next is already starting its run. If you stand still and try to tank the hits, you take a steady stream of damage from several angles at once.
The fix is to keep moving and keep facing the sky. Strafe in a small circle so you can see the next phantom set up, and time your shots or swings to the bottom of each dive. Open ground makes this far easier than a cramped spot where buildings or trees block your view of the incoming pass.
How to fight phantoms
A phantom has 20 health, the same as a player at full hearts. Each swoop deals a couple of hearts of damage depending on your difficulty, a bit more on Hard. That is not huge on its own, but a group of four hitting you in sequence while you also deal with fall risk or other mobs adds up fast.
A bow or crossbow is your best tool. Phantoms spend most of their time out of melee range, circling above you, so ranged attacks let you chip them down before they reach you. If you only have a sword, wait for the swoop. There is a brief moment at the bottom of the dive where the phantom is close and level with you, and that is your chance to land a hit.
The easiest counter of all is the sun. Phantoms are undead, so they catch fire in daylight just like zombies and skeletons. If you can survive until morning, the whole group will burst into flames on its own. Holding out under a tree or a small overhang until sunrise often does the job for you.
Standing under a solid roof also works, since phantoms cannot pass through blocks. They will circle uselessly above your shelter until the sun comes up. A simple two-block-high ceiling is enough to keep them off you.
A shield is a useful backup if a phantom catches you in the open. Raise it and face the diving mob and you can block the bite, taking no damage from that swoop. Blocking will not kill the group the way the sun does, but it buys time while you reposition or wait out the night.
How to stop phantoms for good
Sleeping is the real fix. Getting into a bed at night resets your insomnia counter to zero, and you have to skip three more full nights before phantoms can return. If you sleep most nights, you will almost never see one.
This is the whole point of the mechanic. Phantoms are the game’s gentle push to use your bed instead of grinding through every night underground. If you genuinely cannot sleep, say there are monsters nearby blocking the bed, the counter keeps climbing, so clearing the area and resting is worth the detour.
Dying also resets the counter, though that is obviously not a strategy. The point is that the timer is tied to rest and respawn, not to real time.
Phantom membrane and what it is good for
When a phantom dies it drops 0 to 1 phantom membrane, plus a little experience. The Looting enchantment raises the maximum, so a sword with Looting III can drop up to four membranes from a single phantom. If you want a steady supply, fighting groups with a Looting weapon is the way to stock up.
Membrane has two real uses, and both are good reasons to keep some in a chest.
Repairing an elytra
The elytra is the glider you find in End ships, and it wears down every time you fly. Phantom membrane is what fixes it. Put the elytra and a membrane together in an anvil and each membrane restores a chunk of its durability. Keep a stack of membranes around and your wings effectively last forever.
Brewing slow falling potions
Phantom membrane is also the ingredient for the Potion of Slow Falling. Brew a membrane into an awkward potion and you get a drink that lets you drift down gently for a short time, with no fall damage at the bottom. Add redstone dust to stretch the duration. It pairs well with the elytra for safe landings, and it is a quiet lifesaver in the mountains.
Tips and common mistakes
Do not fight phantoms on a cliff edge or a narrow bridge. Their swoops can knock you back, and a couple of hearts of bite damage matters a lot less than a long fall. Pull back to flat, open ground before you engage.
Keep a bow with you on long surface trips. Phantoms are one of the few threats that come at you from straight above, and a melee-only loadout leaves you swinging at empty air while they reset for another dive.
If you are deliberately farming membrane, let your insomnia build on purpose, then fight the groups in a safe arena rather than wherever you happen to be standing. A lit, walled-off platform with room to aim upward turns a hazard into a reliable resource.
Watch the screech. Phantoms make a distinct sound before and during a dive, and once you learn it you can react to a swoop before you even see the mob.
Frequently asked questions
How many days without sleep before phantoms spawn?
Three full in-game days. After 72,000 ticks without sleeping or dying, the game can start spawning phantoms at night when you are out under open sky.
Do phantoms despawn in daylight?
They do not vanish, but they catch fire and burn up in direct sunlight. If you survive until morning, the group usually destroys itself.
Can phantoms get into my house?
No. Phantoms cannot pass through blocks. A solid roof keeps them out completely, and they will circle above it until day breaks.
What is the point of phantom membrane?
Two things: it repairs an elytra in an anvil, and it brews into the Potion of Slow Falling. Both make it worth saving.
Does sleeping really stop them?
Yes. Sleeping resets your insomnia counter, and phantoms cannot return until you have skipped three more nights.
Do phantoms spawn underground?
No. They need open sky above you and a spawn point at roughly sea level or higher, so caving deep underground keeps you safe even with high insomnia.
The bottom line
Phantoms reward a simple habit. Sleep when you can and you will rarely deal with them at all. When you do want their membrane for an elytra or a slow falling potion, let the insomnia build, pick a flat and open spot, and bring a bow. The sun will help you finish the job.