Fucium Ore is a material found in the Ruins of Wyveria in Monster Hunter Wilds.
To obtain Fucium Ore, players need to progress in the post-credits questline and explore the High Rank version of the Ruins of Wyveria. It can be found in Mining Outcrops.
Fucium Ore is used for upgrading non-monster weapons and crafting non-monster armor pieces in Monster Hunter Wilds. It is also required to upgrade certain weapons and build other weapons in the game.
If players need more Fucium Ore, they can wait for the Mining Outcrops to respawn, explore new areas, or restart the game. Wishlisting an item can help track the required amount of Fucium Ore for specific upgrades.