ENCHANTED DIAMOND SWORD

This is the one weapon on the whole trading list, and the only piece here you swing instead of wear. The Weaponsmith asks 13 to 27 emeralds for it, and the whole appeal is skipping the fight for it: the same pool of Sharpness, Looting, Fire Aspect, Knockback and Sweeping Edge that an enchanting table draws from is already rolled onto the blade before you spend a single emerald.

Looting is the one worth caring about most if you are farming mobs for drops, since nothing else on this trade turns a kill into extra items. There is no way to ask for it specifically, only to keep checking villagers until one of them happens to be holding it.

It arrives at full durability with the roll already applied, at whatever level the game decided when that Weaponsmith last restocked.

The Weaponsmith is the only seller, and only once he has climbed to master, the very top of his ladder. He asks 13 to 27 emeralds depending on the enchantment attached, and no other profession in the game hands over a weapon this strong for any price.

Enchanted Diamond Sword sells for anywhere between 13 and 27 emeralds, from the Weaponsmith at the Master tier, and 2 of the other 4 cost less. That is a rolled price rather than a fixed one, so the Weaponsmith you happen to find matters more than the tier does.

The Weaponsmith at its master tier asks 13 emeralds for an enchanted diamond sword, on its cheapest roll. 8 of the 72 villagers that pay emeralds, emptied out:

13 acacia boats against 312 paper for the same 13 emeralds, 24 times the carrying, and the shortest wait is the Fisherman at 8.1 real minutes of shelf, gathering not counted.

A grindstone next to an unemployed villager claims the Weaponsmith job for him. The sword sits at master, the last tier on his sheet, so every rung under it has to be traded through with real emeralds before it appears at all.

Whatever enchantment he is holding is set the moment he restocks, not the moment you pay, so a better roll means a different villager rather than a second visit to the same one. Break his grindstone before your first trade and he rerolls everything; after that first trade, the sword he offered is the sword that stays on his sheet. How re-rolling works.

Buying it still pays him 30 experience, the same as any other trade, but with nowhere left to climb from the top tier that experience does nothing for him. It is a pure sale, not a step toward anything further.

3 swords and the slot locks, and the Weaponsmith needs 2 real minutes back at his grindstone before it can fill again. A Minecraft day runs 20 real minutes and holds exactly two of those refills, so two full slots is the most one villager will ever offer in a day.

Clear both and the total lands between 78 and 162 emeralds for 6 swords, a spread that has nothing to do with negotiation and everything to do with what each one happened to roll. If you are fishing for a specific enchantment, checking a second Weaponsmith is faster than waiting out this villager's restock.

Fund it the way the Weaponsmith prefers: he pays an emerald for a single diamond, so spare diamonds from a mining trip cover the cost directly instead of routing through some other trader's goods.

The rest of his sheet is worth checking on the same visit. He also sells coal, iron axe, enchanted iron sword, iron ingot, bell and flint, so one stop can level him and stock up at the same time.

Sharpness raises damage against everything and is the safe result. Smite and Bane of Arthropods hit harder but only against the undead or against spiders, so a villager offering one of those is offering a specialist tool at the price of a general one.

Looting is the one that changes how you play: more drops from every mob, which pays for itself on a rabbit foot hunt or a farm. Whatever the roll, an anvil can add a second enchantment from a book later, so a cheap sword with a poor roll is still a base worth buying.

Looting raises how much a mob drops and how often it drops the rare thing, which over a long session is worth more than the few points of damage Sharpness adds. Wither skulls, ender pearls and totems all come faster off a Looting sword.

Sweeping edge is the other one people underrate: it makes the swing hit everything next to the target, which turns a crowd of zombies from a problem into one motion.

Fire Aspect is a trap around anything you want to keep. It sets mobs alight, and a burning mob cooks its own drops, which is fine for beef and ruins anything else.