How do I use portals to prepare for boss fights like Bonemass?

Portals are one of the most powerful tools in Valheim for fast travel and preparation, especially when gearing up for challenging boss fights like Bonemass. To use portals effectively, you must first craft them using Surtling Cores, Fine Wood, and Greydwarf Eyes. These materials are relatively easy to obtain early in the game, making portals accessible even for new players. Once crafted, portals allow you to instantly travel between two linked points, saving time and resources when preparing for boss fights.\n\nTo prepare for Bonemass, you need to establish a portal network that connects your base to the Swamp biome where Bonemass resides. Start by locating Bonemass''s summoning altar using a Vegvisir stone in the Swamp. Once you''ve found the altar, build a small outpost nearby with a portal. This outpost should include a workbench, a chest for storing supplies, and a fire for resting. Link this portal to one at your main base to ensure quick access to resources and crafting stations.\n\nBefore engaging Bonemass, gather essential items like Poison Resistance Mead, Healing Mead, and Stamina Mead. These potions are crucial for surviving Bonemass''s poison attacks and maintaining stamina during the fight. Crafting these meads requires a Fermenter, which is unlocked after defeating The Elder and obtaining the Swamp Key. Stockpile these items at your base and use the portal to transport them to your Swamp outpost efficiently.\n\nWeapon and armor preparation is also critical. Bonemass is weak to blunt damage, so craft a Mace or Iron Sledge if possible. Upgrade your armor to at least Iron-tier for better defense. Use the portal to transport materials like Iron and Leather Scraps back to your base for crafting and upgrades. This ensures you''re fully equipped before the fight without wasting time traveling manually.\n\nOne common challenge is managing inventory space while transporting items through portals. Since portals block certain items like metals, you''ll need to plan ahead. For example, smelt Iron Ore into Iron Bars at your Swamp outpost and transport the bars through the portal. Alternatively, use a Longship to manually transport large quantities of ore if necessary. This strategy minimizes backtracking and keeps your inventory organized.\n\nFinally, always have a backup plan. If you die during the fight, your portal ensures a quick return to the battlefield. Place a bed at your Swamp outpost to set your spawn point, and keep spare gear in a chest nearby. This setup reduces downtime and keeps you focused on the fight.\n\nIn summary, portals are indispensable for preparing for Bonemass. They streamline resource gathering, item transportation, and quick travel, allowing you to focus on the fight itself. By establishing a portal network, crafting essential items, and optimizing your inventory, you''ll be well-prepared to take on Bonemass and other challenging bosses in Valheim.