Durability

Cloak - Hides the user's nametag. When renamed, changes the player to another with skin and username based on cloak name.

Echoing Bottle - Brewed with Echo Shards and Experience Bottles. Rounds up the drinker's XP to a level.

Gilding Table - Increases a random enchantment's level by 1 up to 3 times. Uses gold.

Echoing Chamber - Transfers enchantments between similar items. Consumes Echo Shards.

New Curses
- Curse of Opacity - armor sets to 25%*level opacity
- Curse of Breaking - item takes increased damage per level
- Curse of Voiding - disables all attributes on item
- Curse of Obfuscation - obfuscates enchantment text

Modifications

Smithing Templates - Smithing Templates now have a durability of 4, which lowers when used in a Smithing Table. Templates can be repaired with Diamonds.

Itemstack Durability - Itemstacks now display a durability bar based on their stack limit. Items from Ender Pearls and Stews to Beds and Minecarts have an increased stack size.

Anvil Repairing - Repairing and renaming no longer takes an XP cost. Certain items can be combined in an anvil to change its properties.
- Netherite Scrap - repairs item entirely
- Magma Cream - repairs item by 25% of max durability
- Diamond - adds 32 "Diamond Durability"; cancels breaking based on number of diamond durability
- Player Head - changes player of head
- Dye - changes name color
- Feather - italics
- Ink Sac - bold
- Gunpowder - obfuscation
- Phantom Membrane - hides enchantments and attributes
- Amethyst - adds enchant glint
- Name Tag - sets lore of item to name of nametag
- Prismarine Crystal - undos amethyst, nametag, membrane

Soulbinded Items - Items combined with an Echo Shard in an anvil now respawn in the player's inventory on death, but can only occur once per shard.

Sword Blocking - Swords block now, reducing half damage taken and dealing damage to the sword. Swords can also autoattack. Weapon enchantments can be applied to tools. The Sweeping Edge enchantment enables sweeping on enchanted items.

Bow Inaccuracy - The longer a bow is held, the more the inaccuracy of the arrow increases.

Enchantment Mutex - Enchantments such as Sharpness and Protection have removed mutual exclusivity. 

Fletching - Fletching Tables now have a GUI to combine arrows with potions and craft fireworks.

Enchanting - Enchanting Tables have a new slot for books, which spreads a random enchantment on the book across all options on the table. Amethyst used on an option rerolls the option. Echo Shards in the book slot reduce the enchant requirement by half. Hovering over an option with a Spyglass shows all enchantments given by option.

Etc. - Compass shows coordinates, Clock shows time, Recovery Compass shows distance from death, and Spyglass shows the block looking at and distance. Enchanted Horse Armor. Mobs wearing full enchanted armor have a base enchant glint. Enchantments have roman numerals beyond level 10.