POTION OF INVISIBILITY

Potion of Invisibility is a Wandering Trader exclusive: no job villager buys or sells it at all, so the roaming merchant with the two llamas is the only source, at 5 emeralds each.

It is a utility, magical item normally tied to the Cleric's brewing-stand economy on this site, and trading is a dependable way to keep one in stock without setting up a brewing stand at all.

The Wandering Trader sells potion of invisibility for 5 emeralds each, out of his uncommon stock, when that stock happens to include it. He does not buy one back off a player either, that offer runs one way.

No standard village profession lists potion of invisibility in its trade table, so this one roaming merchant is the whole market for it.

He asks 5 emeralds each, and 72 of the other 75 come cheaper. Price is the easy part: he draws a rare slot from a shared pool, so catching one that happens to be carrying potion of invisibility is the real constraint.

The Wandering Trader asks 5 emeralds for a potion of invisibility. 8 of the 72 villagers that pay emeralds, emptied out:

5 oak boats against 120 flint for the same 5 emeralds, 24 times the carrying, and the shortest wait is the Butcher at 3.1 real minutes of shelf, gathering not counted.

The Wandering Trader is not part of any village. He arrives on his own near wherever a player is playing, with two leashed trader llamas behind him, stays for roughly forty minutes to an hour, and then vanishes whether or not a trade happened. There is no workstation to place and no job block to break, so the usual tricks for steering a regular villager toward a particular offer do nothing for him.

He does not buy potion of invisibility off a player, only sells it, so the offer runs one direction: emeralds out of an inventory, up to 1 potion into it per visit if the uncommon-pool roll included it at all.

Each trader carries only a slice of his full stock list, so the one standing in front of a player may simply not have it that day. If he does, and more than one visit's worth is wanted, a name tag on him fixes that for good: a named mob will not despawn, turning a passing merchant into a permanent shop instead.

What a full stack costs: he asks 5 emeralds each, so a full stack of 64 comes to 320 emeralds.

Worth knowing: 8:00 duration.

Also on the wandering trader's list: acacia log, birch log, dark oak log, jungle log, oak log, and spruce log.

The potion hides your body, not your equipment. Armour, a held item, an arrow in flight and anything stuck to you stay perfectly visible, which is why players who plan to use it take the armour off first and carry nothing in hand.

Mobs are not blind to it either. Hostile mobs still notice you at close range, and attacking gives you away immediately, so the effect buys distance rather than safety. Against other players it is closer to a disguise than a cloak: the outline is gone, the name tag above your head is not.

The recipe is a chain rather than a single step: a nether wart potion, then a golden carrot for night vision, then a fermented spider eye to flip it into invisibility. Three brewing rounds and two ingredients that each take their own trip, which is most of the case for buying it.

Redstone extends it and glowstone does nothing to it, because there is no stronger tier of invisible. That makes redstone the only upgrade worth applying, and it roughly doubles the time you get.

Splashing it on somebody else works, and so does giving it to a mob, which is the trick behind an invisible pet and behind the invisible skeleton that ruins somebody's day.