LANTERN

A lantern does not feed you and no recipe on this list calls for one, it is bought purely for light and looks. A Librarian at apprentice sells 1 lantern for 1 emerald, the kind of small, repeatable purchase that adds up once you are lighting an entire build rather than one room.

which for most players means iron nuggets saved up from smelting rather than a whole separate mining trip, so buying from the Librarian is mostly a question of whether that iron is better spent elsewhere.

One seller. A Librarian reaching apprentice, level 2 of five, sells 1 lantern for 1 emerald, a rate fixed in the trade file rather than something a villager rolls for himself.

Lantern sells for as little as 1 emerald, from the Librarian at the Apprentice tier, and 1 of the other 6 costs less. The price is fixed rather than rolled, so a second Librarian will quote you exactly the same.

The Librarian at its apprentice tier asks 1 emerald for a lantern. 8 of the 72 villagers that pay emeralds, emptied out:

an acacia boat against 26 flint for the same 1 emerald, 26 times the carrying, and the shortest wait is the Butcher at 37.5 real seconds of shelf, gathering not counted.

Apprentice needs 10 banked trading experience, earned from whatever the Librarian sold or bought before that tier, before lantern shows up on his table.

12 sales close the slot, then a restock brings the same offer back rather than swapping in something new.

12 sales close the row, needing 2 real minutes idle before it restocks, comfortably inside the 20-minute villager day.

Stay for both refills and one Librarian sells 24 lantern for 24 emeralds a Minecraft day, enough to light a fair stretch of a build without a second trip.

Buy the whole slot in one visit if you are lighting a large build: 12 lantern for 12 emeralds before it locks and needs a restock.

Where the emeralds come from: the same Librarian pays an emerald per 4 books, spare copies you likely already have lying around.

Also on the Librarian's list: ink sac, glass, book and quill, clock, compass, and yellow candle.

Eight iron nuggets around a torch make a lantern, and the difference is where it goes: a lantern hangs under a block on a chain or sits on the floor, which lets a corridor be lit from the ceiling instead of from the walls.

It burns as brightly as a torch and it survives water, so it is the light of choice for a dock or a flooded mine. The soul version made with soul fire gives a dimmer blue light and frightens piglins, which is the one case where a lantern does something other than shine.

The same eight iron nuggets around a soul torch make a soul lantern instead, and the difference is not only colour. Soul fire light frightens piglins, which makes a soul lantern a fence a piglin will not cross, and it is dimmer than the ordinary kind.

Chains are the other half of the build. A lantern hangs from a chain, and a chain hangs from a chain, so a light can be dropped several blocks below a ceiling without anything visible holding it up.

Lanterns can be waterlogged, so they light a dock or a flooded room without going out, and placing one on a fence post gives the standard village lamp without any redstone.