How do you craft the Frostner hammer, and why is it effective in the Plains?

The Frostner hammer is one of the most powerful weapons in Valheim, especially effective in the Plains biome due to its unique combination of frost and spirit damage. To craft Frostner, you need to unlock the recipe by obtaining its required materials and upgrading your Forge to level 3. The hammer is crafted using 10 Ancient Bark, 30 Silver, 5 Ymir Flesh, and 5 Freeze Glands. Ancient Bark is obtained from Ancient Trees in the Swamp biome, Silver is mined in the Mountain biome, Ymir Flesh is purchased from Haldor the merchant in the Black Forest, and Freeze Glands are dropped by Drakes in the Mountains.\n\nTo begin crafting Frostner, you must first progress through the game to unlock the necessary resources. Start by exploring the Swamp biome to gather Ancient Bark from Ancient Trees. These trees are large and distinct, often found near Sunken Crypts. Next, venture into the Mountains to mine Silver Ore. Silver requires an Iron Pickaxe to mine and can only be detected using the Wishbone, which is obtained by defeating Bonemass, the Swamp biome boss. Once you have Silver, smelt it in a Smelter to create Silver Bars.\n\nYmir Flesh is a unique material sold by Haldor, the merchant found in the Black Forest. Haldor''s location is random, so you may need to explore extensively to find him. Once located, purchase Ymir Flesh using Coins, which can be obtained by looting chests or defeating enemies. Finally, Freeze Glands are dropped by Drakes, flying creatures in the Mountains. Drakes are relatively easy to defeat with a bow or melee weapon, but be cautious of their frost attacks.\n\nOnce you have all the materials, head to a Forge upgraded to level 3. Place the Ancient Bark, Silver Bars, Ymir Flesh, and Freeze Glands in your inventory and interact with the Forge to craft Frostner. The hammer requires a level 3 Forge, so ensure you have the necessary upgrades, such as a Forge Cooler, Anvils, and a Tool Shelf.\n\nFrostner is particularly effective in the Plains biome due to its frost and spirit damage. The frost damage slows enemies, making it easier to manage fast-moving foes like Fulings and Deathsquitos. The spirit damage is highly effective against undead enemies, such as Skeletons and Draugr, which are common in the Plains. Additionally, Frostner''s knockback effect helps create distance between you and dangerous enemies, giving you time to recover or reposition.\n\nOne common challenge when using Frostner is managing stamina consumption. The hammer''s special attack consumes a significant amount of stamina, so it''s essential to have a high stamina pool or use stamina-boosting foods like Serpent Stew or Bread. Another tip is to pair Frostner with a shield for added defense, as the Plains biome is home to powerful enemies that can deal heavy damage.\n\nIn summary, Frostner is a versatile and powerful weapon that excels in the Plains biome due to its frost and spirit damage. Crafting it requires gathering materials from the Swamp, Mountains, and Black Forest, as well as upgrading your Forge. Use Frostner to slow enemies, deal spirit damage, and create distance with knockback. Pair it with stamina-boosting foods and a shield for optimal performance in the challenging Plains biome.