The Elder boss fight environment effects is a fx item in Valheim. Its in-game item ID is eventzone_gdking, which you can drop into the console with spawn eventzone_gdking to give yourself one — append a number like spawn eventzone_gdking 50 to spawn a stack. The Elder boss-fight environment effects are the internal eventzone that applies forest-fog visuals during The Elder encounter. It is not a player item. The spawn command requires cheats — enable them with devcommands after opening the console.
Spawns one The Elder boss fight environment effects at your location.
Spawns one The Elder boss fight environment effects at your location.
Spawns five The Elder boss fight environment effects at your location.
Spawns twenty The Elder boss fight environment effects at your location.
The Elder boss-fight environment effects are the internal eventzone that applies forest-fog visuals during The Elder encounter. It is not a player item.