The Alchemy Pot is a crucial feature that allows you to combine various ingredients to create new and more powerful items, weapons, and armor. You'll gain access to the Alchemy Pot relatively early in the game. Recipes can be found in bookshelves, learned from NPCs, or discovered through experimentation. The Alchemy Pot is essential for obtaining some of the best gear in the game, especially in the post-game content.
To use the Alchemy Pot, simply select the 'Alchemy' option from your main menu. You can then choose a recipe you know or attempt to combine items through 'Freeform Alchemy'. Successful freeform alchemy will add the recipe to your list. Always keep an eye out for sparkling spots on the world map and in dungeons, as these often yield rare crafting ingredients. Don't sell all your seemingly useless items; many of them are valuable alchemy components. Investing time in alchemy can save you a lot of gold and provide access to equipment far superior to what's available in shops.