How do I calculate the number of cores for a portal network?

In Valheim, building a portal network is essential for efficient travel across the vast world. Portals allow you to instantly teleport between two connected points, saving time and resources. However, creating a portal network requires careful planning, especially when it comes to calculating the number of cores needed. Cores are a critical resource for crafting portals, and understanding how to manage them is key to building an effective network.\n\nTo craft a portal, you need 20 Fine Wood, 2 Surtling Cores, and 10 Greydwarf Eyes. Surtling Cores are the most challenging resource to obtain, as they are primarily found in Burial Chambers in the Black Forest biome or by defeating Surtlings in the Ashlands biome. Each portal requires 2 Surtling Cores, so the number of cores you need depends on how many portals you plan to build. For example, a basic two-portal network (one pair) requires 4 Surtling Cores, while a larger network with multiple pairs will require significantly more.\n\nTo calculate the number of cores needed for your portal network, start by determining how many portal pairs you want. Each pair consists of two portals linked by the same tag name. For instance, if you want to connect your base to five different locations, you will need five portal pairs, totaling 10 portals. Since each portal requires 2 Surtling Cores, you will need 20 cores for this setup. Always plan for extra cores in case you decide to expand your network later.\n\nOne common challenge is finding enough Surtling Cores early in the game. Burial Chambers in the Black Forest are the best source, but they can be dangerous for new players. To mitigate this, explore with a friend or equip yourself with basic weapons and armor before venturing into these dungeons. Alternatively, you can farm Surtlings in the Ashlands biome, though this is more suitable for experienced players due to the high difficulty.\n\nAnother practical tip is to prioritize portal locations. Focus on connecting high-traffic areas, such as your main base, resource-rich biomes like the Swamp or Mountains, and key exploration points. This minimizes the number of portals you need and conserves cores. For example, instead of building separate portals for each Swamp crypt, create a single portal near the Swamp entrance and explore on foot from there.\n\nFinally, consider using a central hub system for your portal network. Build a dedicated portal hub at your main base, where all portals are grouped together. This makes it easier to manage and expand your network. Label each portal clearly with its destination to avoid confusion. For example, name one portal ''Swamp'' and another ''Mountain'' to quickly identify where each leads.\n\nIn summary, calculating the number of cores for a portal network involves determining the number of portal pairs you need and multiplying by 2. Plan your network carefully, prioritize high-traffic locations, and consider using a central hub system for efficiency. With these tips, you can build a robust portal network that enhances your Valheim experience.