What crafting materials are needed to summon Bonemass?

Summoning Bonemass, the third boss in Valheim, requires specific crafting materials and preparation. Bonemass is a challenging boss found in the Swamp biome, and summoning him requires 10 Withered Bones. These bones are rare and can only be found in specific locations within the Swamp biome. To summon Bonemass, you must first locate his altar, which is marked by a glowing red skull on the map. Once you find the altar, you can place the Withered Bones in the offering bowl to initiate the fight.\n\nTo gather Withered Bones, you will need to explore Sunken Crypts within the Swamp biome. These crypts are dungeon-like structures that contain muddy scrap piles, which can be mined with a Bronze or Iron Pickaxe. Withered Bones are found inside these scrap piles, but they are not guaranteed drops, so you may need to clear multiple crypts to collect enough bones. Be prepared for tough enemies like Draugr and Blobs inside the crypts, so bring strong weapons, armor, and healing items.\n\nBefore attempting to summon Bonemass, it is crucial to prepare for the fight. Bonemass is resistant to most damage types except blunt damage, so weapons like the Iron Mace or Stagbreaker are highly effective. Additionally, the Swamp biome is filled with hazards like poison and water, so crafting Poison Resistance Mead is essential. This mead can be brewed at a Fermenter using ingredients like Honey, Thistle, Neck Tail, and Guck. Wearing armor with high poison resistance, such as the Root Mask, can also help mitigate damage.\n\nOnce you have the Withered Bones and are fully prepared, head to Bonemass''s altar. The altar is surrounded by a large, circular area, so clear any nearby enemies before summoning the boss. Place the 10 Withered Bones in the offering bowl to summon Bonemass. The fight will begin immediately, so be ready to dodge his attacks and use your blunt weapon to deal damage. Bonemass has a powerful melee attack, a poison cloud ability, and the ability to summon minions, so staying mobile and managing your stamina is key.\n\nA practical tip for the fight is to build a small base or platform near the altar before summoning Bonemass. This can serve as a safe spot to retreat, heal, and recover stamina during the battle. Additionally, bringing a bow and arrows can help deal with the minions Bonemass summons, though it is less effective against the boss itself. After defeating Bonemass, you will receive the Wishbone, which allows you to locate hidden treasures and silver veins in the Mountains biome.\n\nIn summary, summoning Bonemass requires 10 Withered Bones, which are found in Sunken Crypts within the Swamp biome. Prepare for the fight by crafting Poison Resistance Mead, equipping blunt weapons, and wearing poison-resistant armor. Clear the area around the altar and consider building a small base nearby for safety. Defeating Bonemass rewards you with the Wishbone, unlocking new opportunities for exploration and progression in Valheim.