Phantom Membrane repairs Elytra at an anvil and brews the Potion of Slow Falling in Minecraft.
Guide
Stay awake for at least three in-game days to trigger Phantom spawns at night. Kill Phantoms with a sword enchanted with Looting III to get up to 4 Phantom Membrane per phantom.
Place a damaged Elytra in the first anvil slot and a Phantom Membrane in the second slot. Each Phantom Membrane restores 108 durability, so 4 membranes fully repair an Elytra from zero.
Place an Awkward Potion in the Brewing Stand and add a Phantom Membrane on top. The result is a Potion of Slow Falling lasting 1:30 in Minecraft.
Add Redstone Dust to the Potion of Slow Falling to extend its duration to 4:00. Use it to survive Elytra crashes and high falls without taking fall damage.
Tame cats with raw cod or salmon and sleep next to them. Cats occasionally drop Phantom Membrane as a morning gift, offering a peaceful alternative to combat farming.
A sword with Looting III increases the maximum Phantom Membrane drop from 1 to 4 per phantom kill, making it the fastest farming method.
Phantom Membrane drops from Phantoms killed at night. Each Phantom drops 0-1 Phantom Membrane, or up to 0-4 with a Looting III sword. Cats also occasionally bring Phantom Membrane as a morning gift.
One Phantom Membrane restores 108 durability points on an Elytra at an anvil, which is 25% of the Elytra's 432 maximum durability. Four Phantom Membranes fully repair a broken Elytra.
Place an Awkward Potion in a Brewing Stand and add a Phantom Membrane on top. The result is a Potion of Slow Falling lasting 1:30, extendable to 4:00 with Redstone Dust.
No. Phantom Membrane cannot be crafted from any recipe in Minecraft. It must be obtained as a drop from Phantoms or as a gift from a tamed cat.
Phantoms only spawn at night above players who have not slept for at least three in-game days. Sleep in a bed and the insomnia counter resets, preventing Phantom spawns and Phantom Membrane drops.