How do you unlock and craft the Blast Furnace for advanced metalworking?

The Blast Furnace is a crucial structure in Valheim for advanced metalworking, allowing you to smelt Black Metal and Flametal Ore. To unlock and craft the Blast Furnace, you must first progress through the game and defeat Moder, the fourth boss in the Mountain biome. Moder drops Dragon Tears, a key ingredient required to craft the Artisan Table, which is necessary for building the Blast Furnace.\n\nTo begin, you need to locate and defeat Moder. Moder is found in the Mountain biome, and summoning her requires three Dragon Eggs, which are heavy items found in the same biome. Once Moder is defeated, you will receive Dragon Tears. These tears are used to craft the Artisan Table, which unlocks advanced crafting recipes, including the Blast Furnace.\n\nAfter obtaining Dragon Tears, you can craft the Artisan Table at a Workbench. The Artisan Table requires 10 Wood, 2 Dragon Tears, and 4 Iron. Place the Artisan Table near your base, as it will serve as the crafting station for the Blast Furnace. Once the Artisan Table is built, you can access the Blast Furnace recipe in the crafting menu.\n\nCrafting the Blast Furnace requires 20 Fine Wood, 10 Iron, 20 Stone, and 5 Surtling Cores. Fine Wood is obtained by chopping down Birch or Oak trees in the Meadows or Plains biomes. Iron is mined from Muddy Scrap Piles in the Swamp biome, and Stone is gathered from rocks found throughout the world. Surtling Cores are dropped by Surtlings in the Ashlands biome or found in Burial Chambers in the Black Forest.\n\nOnce you have gathered all the materials, place the Blast Furnace near your base, preferably close to your existing Smelter and Forge for efficiency. The Blast Furnace operates similarly to the Smelter but can process higher-tier ores like Black Metal and Flametal. To use it, load the furnace with Coal and the desired ore, and it will begin smelting.\n\nA common challenge players face is gathering enough Surtling Cores. If you are struggling to find them, consider exploring Burial Chambers in the Black Forest or farming Surtlings in the Ashlands. Another tip is to ensure your base is well-protected, as the Blast Furnace is a valuable asset and may attract enemy raids.\n\nIn summary, unlocking and crafting the Blast Furnace requires defeating Moder, crafting the Artisan Table, and gathering the necessary materials. This advanced structure is essential for progressing to the late game, allowing you to smelt high-tier metals and craft powerful gear. Plan your resource-gathering trips carefully, and always be prepared for enemy encounters while exploring dangerous biomes.