Java Edition:Pre-Villager Trade Rebalance Villager

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This article is a work in progress. 
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To do: Add full data table with information about trades that are no longer possible with the (future) changes. [For right now, please refer to the Minecraft Wiki to infer what is no longer possible as this page is updated.]. Furthermore, librarian enchanted book trades are now split into the categories "Special" and "Normal" meaning that certain enchants might only be able to appear in certain villager "levels" witht these changes, meaning that a discontinued feature might be possible from this. This should be tested and written about if applicable.

Villager trade rebalancing will be a feature that, once fully implemented, will change villager trades to rely on the biome that they correspond to, replacing the more randomized approach to villager trades. These changes will discontinue many villager trades from villagers that have trades that are not going to be possible once this feature comes to a future update. This discontinued feature is already partially implemented as of 1.21.5, where new cartographer and wandering trader changes were implemented.

Discontinued Trades

Librarian

Changes to villager trading will make librarian enchanted book trades rely on the biome that they are from.

Biome Enchantments No Longer Obtainable from Librarians
Desert Feather Falling, Projectile Protection, Power, Unbreaking, Protection, Sharpness, Knockback, Silk Touch, Looting, Frost Walker, Depth Strider, Respiration, Mending, Curse of Vanishing, Blast Protection, Fire Aspect
Jungle Efficiency, Power, Smite, Bane of Arthropods, Protection, Sharpness, Knockback, Silk Touch, Looting, Frost Walker, Depth Strider, Respiration, Mending, Curse of Vanishing, Blast Protection, Fire Aspect
Plains Efficiency, Unbreaking, Feather Falling, Projectile Protection, Power, Flame, Sharpness, Knockback, Silk Touch, Looting, Frost Walker, Depth Strider, Respiration, Mending, Curse of Vanishing, Blast Protection, Fire Aspect
Savanna Efficiency, Unbreaking, Feather Falling, Projectile Protection, Power, Protection, Flame, Silk Touch, Looting, Frost Walker, Depth Strider, Respiration, Mending, Curse of Vanishing, Blast Protection, Fire Aspect
Snow Efficiency, Unbreaking, Protection, Smite, Bane of Arthropods, Power, Sharpness, Knockback, Silk Touch, Looting, Depth Strider, Respiration, Mending, Curse of Vanishing, Fire Aspect
Swamp Efficiency, Unbreaking, Feather Falling, Projectile Protection, Power, Protection, Sharpness, Knockback, Smite, Bane of Arthropods, Silk Touch, Frost Walker, Fire Aspect
Taiga Efficiency, Unbreaking, Feather Falling, Projectile Protection, Power, Protection, Smite, Bane of Arthropods, Silk Touch, Looting, Frost Walker, Mending, Curse of Vanishing

Combos