How do you unlock the Bonemass Power and what’s its benefit?

Unlocking the Bonemass Power in Valheim is a significant milestone that requires preparation, exploration, and defeating one of the game''s toughest bosses. Bonemass is the third boss in Valheim, and its power provides a massive advantage in combat, especially in the Swamp biome. To unlock this power, you must first locate Bonemass''s summoning altar, gather the required items, and defeat the boss in a challenging fight.\n\nTo begin, you need to find Bonemass''s Vegvisir, a runestone that reveals the boss''s location. These runestones are typically found in Sunken Crypts within the Swamp biome. Sunken Crypts are recognizable by their green torches and iron gates. Once inside, explore the crypt thoroughly to locate the Vegvisir, which will mark Bonemass''s summoning altar on your map. If you haven''t explored the Swamp biome yet, prepare by crafting a Bronze or Iron weapon, as well as poison resistance mead, which is essential for surviving the biome''s hazards.\n\nAfter locating the summoning altar, you''ll need to gather the required offering to summon Bonemass: 10 Withered Bones. These bones are found in Muddy Scrap Piles inside Sunken Crypts. Use a Wishbone, obtained by defeating the second boss, The Elder, to locate these piles more efficiently. Once you have the bones, head to the altar and place them in the bowl to summon Bonemass. Be prepared for a tough fight, as Bonemass is resistant to most damage types except blunt weapons like maces.\n\nDefeating Bonemass requires careful preparation. Equip yourself with a fully upgraded Iron Mace, a strong shield, and the best armor you can craft, such as Iron or Wolf Armor. Bring plenty of healing mead, stamina mead, and poison resistance mead, as Bonemass deals heavy poison damage and summons adds like Blobs and Skeletons. During the fight, focus on dodging its melee attacks and clearing adds quickly. Use the terrain to your advantage by kiting Bonemass around trees or rocks to avoid its attacks.\n\nOnce Bonemass is defeated, you''ll receive its trophy and a Wishbone. Place the trophy on the sacrificial stone at your starting point to unlock the Bonemass Power. This power reduces all physical damage by 50% for 5 minutes, making it invaluable for tough fights or exploring dangerous biomes like the Plains. Activate the power by pressing F, but be mindful of its 20-minute cooldown. Use it strategically during boss fights, raids, or when facing large groups of enemies.\n\nFor new players, unlocking Bonemass Power is a game-changer, as it significantly boosts survivability. Experienced Vikings can use it to tackle higher-tier content like Fuling camps or Moder, the fourth boss. Always carry materials to craft a portal near the summoning altar to avoid long treks back if you die. Additionally, consider building a small base nearby with a bed, workbench, and storage to prepare for the fight.\n\nIn summary, unlocking Bonemass Power involves exploring the Swamp biome, gathering Withered Bones, and defeating the boss in a well-prepared fight. The power''s damage reduction is a powerful tool for both new and experienced players, making it a must-have for progressing through Valheim''s challenges.