For most people with a herniated disk, low back pain is the initial symptom. This pain may last for a few days, then improve. It is often followed by the eventual onset of leg pain, numbness, or weakness. This leg pain typically extends below the knee, and often into the foot and ankle.
Iron Nuggets are used for crafting very basic thaumaturgic tools, including your very first wand. Besides crafting, they can be produced as bonus material by the Infernal Furnace.
Anvils are crafting by placing 3 blocks of iron across the top of a 3 by 3 crafting grid, and three iron ingots on the bottom, finished with 1 iron ingot in the middle of the grid. Anvils are used for enchanting, renaming, and repairing tools and items in Minecraft.