This hyper-realistic 3D model depicts a legendary fantasy sword crafted from polished obsidian, with glowing, pulsating runes etched along its double-edged blade. The runes shift between crimson and electric blue, channeling ancient energy. A glowing purple crystal core is embedded near the hilt, which features a dragon-scale texture and eagle-wing handguard with gold accents. A radiant orb at the pommel pulses in sync with the runes, completing its mystical aura.