boss, Valheim, despawn, game mechanics, creature, Viking, mythological, forest, meadows, boss arena, in-game time limit, player distance, combat, survival, multiplayer, PvE, misty environment, low light, tense atmosphere, strategic positioning, Norse mythology, epic battle, dynamic weather, immersive experience, co-op gameplay, environmental interaction, day-night cycle, challenging encounter, boss health bar, stamina management, resource management.