Create a dark fantasy winged helmet forged from black, matte metal with glowing toxic-green cracks. The faceplate should look sharp and sinister, with bright green glowing eyes that feel alive. Large jagged metallic wings rise from the sides, each feather chipped and threaded with faint green energy. A fractured emerald crystal sits in the center crest, pulsing with corrupted power. Overall mood: gothic, powerful, ominous, ancient.