游戏原画：熔岩黑曜要塞

Fantasy game key art of an obsidian fortress carved into a volcanic hellscape, towering basalt walls with glowing orange lava pouring from gargoyle spouts into a moat of molten rock, jagged black towers with wrought-iron gates, a portcullis raised halfway with molten drips, heavy chains and bronze braziers along the battlements, silhouetted demonic winged creatures circling a blood-red sky, obsidian spikes jutting from the mountain slopes around the fortress, a lone armored knight on a skeletal horse crossing a narrow stone causeway in the foreground for scale, his red cape and lance catching the glow, wide establishing shot from a low angle, harsh red-orange underlight from the lava below, dark smoky atmosphere with flying sparks and embers drifting upward like fireflies, black-and-ember palette, high-contrast dramatic lighting, thick textured concept-art painting with visible brushwork, epic dark-fantasy mood, cinematic composition, 4k