What biome-specific resources are needed to summon Bonemass?

To summon Bonemass, the third boss in Valheim, you need to gather specific biome-specific resources and craft a summoning item called the Bonemass Vegvisir. Bonemass is located in the Swamp biome, and preparing for this fight requires careful planning and resource gathering.\n\nFirst, you must locate the Swamp biome. This biome is characterized by its dark, murky atmosphere, leafless trees, and dangerous enemies like Draugr, Leeches, and Blobs. To summon Bonemass, you need 10 Withered Bones, which are found in Sunken Crypts within the Swamp. These crypts are dungeon-like structures guarded by Draugr and require a Swamp Key to enter. The Swamp Key is obtained by defeating The Elder, the second boss in Valheim.\n\nOnce inside a Sunken Crypt, explore the muddy scrap piles using a Wishbone (obtained from defeating Bonemass’s predecessor, The Elder) to locate Withered Bones. These bones are rare, so you may need to clear multiple crypts to gather enough. Be prepared for combat, as the crypts are filled with enemies and environmental hazards like poison.\n\nAfter collecting 10 Withered Bones, head to Bonemass’s summoning altar, which is marked by a glowing red Vegvisir runestone found in Swamp biome structures. The altar itself is a large skull-shaped structure surrounded by water. Place the Withered Bones on the altar to summon Bonemass.\n\nBonemass is a challenging boss with high health and powerful attacks. He primarily uses melee strikes and a poison AoE ability, making poison resistance mead essential for this fight. Craft this mead using Honey, Thistle, Coal, and Neck Tails at a Fermenter. Additionally, equip yourself with Iron-tier weapons and armor, as the Swamp biome is home to Iron, which is crucial for upgrading your gear.\n\nDuring the fight, focus on dodging Bonemass’s attacks and using blunt weapons like the Iron Mace, as he is weak to blunt damage. Kiting him around the altar area can help avoid his poison clouds. Bring healing mead and stamina-restoring food like Sausages and Turnip Stew to sustain yourself during the battle.\n\nAfter defeating Bonemass, you will receive the Wishbone, which helps locate buried treasures and resources like Silver in the Mountains biome. This item is essential for progressing further in the game.\n\nPractical tips for this fight include clearing the area around the altar of enemies before summoning Bonemass, as additional mobs can complicate the battle. Building a small shelter nearby with a portal can provide a quick escape or respawn point if needed. Lastly, always ensure your gear is fully repaired and your inventory is stocked with necessary items before engaging in the fight.\n\nIn summary, summoning Bonemass requires 10 Withered Bones from Swamp biome Sunken Crypts, a Swamp Key from The Elder, and careful preparation with poison resistance mead and Iron-tier gear. Defeating Bonemass grants the Wishbone, a key item for advancing in Valheim.