Armored fantasy knight holding a glowing purple rune sword stands

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This dramatic dark fantasy artwork features a menacing paladin in black full armor etched with glowing purple runes, standing atop a jagged mountain summit above swirling fog. Crackling lightning flashes across the dark stormy twilight sky behind him, as he grips an enchanted greatsword also marked with glowing runes. The mood is imposing, powerful and epic, with moody dark tones and vivid neon purple magic accents.