boss, Valheim, despawn, game mechanics, creature, Viking, mythological, forest, misty, night time, torchlight, tense atmosphere, survival, multiplayer, action, strategy, boss arena, ancient stones, rune summoning, epic battle, challenging, health bar, player characters, cooperative, foggy weather, dynamic lighting, immersive environment, detailed textures, high-resolution models, in-game physics, boss abilities, environmental effects, tactical combat, dramatic music, 3D landscape, real-time combat, boss fight, Norse mythology.