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Create a circular emblem-style logo that looks like a digital seal for a secret society. Inside the circle, depict a side profile of a skull, sharp and detailed, symbolizing hidden knowledge and mortality. A sword pierces straight through the skull from top to bottom, clean and symmetrical, representing truth cutting through secrecy. Surround the imagery with subtle geometric patterns (concentric rings, runic-like markings, or circuit-inspired etching) to blend ancient secret society aesthetics with modern AI decoding themes. Use a dark base palette (black, deep gray, indigo) with glowing accents in cyan or metallic gold, giving the design a mysterious, encrypted, high-tech aura. The design should be bold, iconic, and instantly recognizable as a digital insignia when placed on files.