Changed Treasurer is a datapack that overhauls most of Minecraft's loot tables, changing most of the loot associated in chests, fishing, even blocks!
Changes
Mobs
Most Minecraft mobs has their loot table changed. Zombie variants now has their own different special drops and meats from animals are usually more limited, making looting less effective. Any mob that has their own mob head will have 10% to drop it, similar to how wither skeletons can drop their heads.
Treasure Chests
Most of the treasure chests has their loot changed to better reflect the environment they are generated in, as well enchantment books are incorporated too. However no diamonds will be present in any apart from those in End Cities, marking a clear progression of materials.
Enchantments
Both fire aspect and vanishing curse has gotten a new feature for ore mining! Enchanting your pickaxe with fire aspect will smelt copper/iron/gold ores into their ingot forms. With vanishing curse, it doubles your dropped output. Fire aspect and vanishing can work together alongside the benefits of fortune. Silk touch will be prioritized over them however.
Blocks
Good news farmers, you can now use fortune to increase your crop yield instead of their seeds! Most crops have been changed with their own different rates of crop yield, even sniffer exclusive ones are able to let you reuse a seed. Ores has also been changed, with deepslate variants doubling the amounts you receive compared to stone variants.