How do you unlock the crystal for decorative building pieces?

To unlock crystal for decorative building pieces in Valheim, you must first locate and defeat Moder, the fourth boss in the game. Moder is found in the Mountain biome, and summoning her requires three Dragon Eggs placed on her altar. Defeating Moder will reward you with the Dragon Tear, a key item needed to unlock the Artisan Table, which is essential for crafting crystal-based decorative pieces.\n\nOnce you have the Dragon Tear, return to your base and build the Artisan Table. This requires 10 Wood, 2 Fine Wood, and 1 Dragon Tear. Place the Artisan Table near your Forge and Smelter, as it works in conjunction with these crafting stations. The Artisan Table unlocks advanced building materials, including crystal, which is used for decorative windows and other aesthetic structures.\n\nTo obtain crystal, you must venture into the Mountain biome and mine crystal deposits. These deposits resemble large, glowing blue rocks and can be mined with an Iron Pickaxe or better. Each deposit yields 1-4 crystal shards, which are used directly in crafting. Be prepared for harsh weather and hostile creatures like Drakes and Wolves while mining in the Mountains.\n\nOnce you have collected enough crystal, you can craft decorative pieces like the Crystal Wall and Crystal Floor. These items are crafted at the Artisan Table and require 1 crystal per piece. Crystal structures are purely decorative and do not provide structural support, but they add a unique, elegant touch to your builds. They are particularly useful for creating windows, skylights, or decorative accents in your base.\n\nA common challenge players face is surviving in the Mountain biome while mining crystal. To mitigate this, ensure you have Frost Resistance Mead or Wolf Armor to withstand the cold. Bring a strong weapon, such as a Draugr Fang bow or Frostner, to deal with Drakes and Wolves. Additionally, consider building a small outpost near the crystal deposits to store resources and recover health during mining trips.\n\nFor new players, unlocking crystal may seem daunting due to the need to defeat Moder. However, Moder is manageable with proper preparation. Craft a Draugr Fang bow and stock up on Poison and Frost arrows. Use the terrain to your advantage during the fight, and bring healing mead to sustain yourself. Once Moder is defeated, the path to crystal crafting becomes much more accessible.\n\nIn summary, unlocking crystal for decorative building pieces involves defeating Moder, building an Artisan Table, and mining crystal in the Mountain biome. With the right preparation and strategy, you can incorporate these beautiful structures into your Valheim builds, enhancing both functionality and aesthetics.