Transmutation: Equivalent Exchange

The Extraction Table is crafted with 2 gold ingots and 4 wood planks. Right-clicking it will turn the items in your hand into Lead Scraps, which can be smelted into Lead Ingots, and provide you with xp points. Yes, this is completely scientifically inaccurate. No, I don't care. 

The Transmutation Table is crafted with 2 lead ingots and 4 wood planks. Right-clicking it with some items will turn them into other items, at the cost of xp. They'll be at the bottom of this spoiler. There is one very important item created in this way: True Gold. True Gold ingots are created by right-clicking a Transmutation Table with Lead Ingots, at a cost of a hefty amount of experience(exactly the amount it takes to get to level 500 from level 0). True Gold can be crafted into tools and armor that have a high enchantability, and are otherwise similar to Netherite gear.

Recipes:

-Logs can be turned into other logs

-Wheat and Beetroot Seeds can be turned into one another

-Carrots and Potatoes  can be turned into one another

-Pumpkin Seeds and Melon Seeds can be turned into one another

-Glowberries and Sweet Berries can be turned into one another

-Amethyst Shards and Nether Quartz can be turned into one another

-Redstone Dust, Glowstone Dust, Gunpowder, and Sugar can be turned into one another

-Sand and Red Sand can be turned into one another

-Soul Sand and Soul Soil can be turned into one another

The Carrot Pendant is a Trinket worn in the necklace slot. It uses up xp points to restore hunger and saturation when you would be able to eat. It is crafted with 4 True Gold ingots, 1 carrot, and 1 lead(the leash, not the ingot).

-In-game Patchouli Guidebook