Capture in action pose the terrifying presence of the medusa, a mythical female with obsidian snake hair head and petrifying gaze. Emphasise the malicious nature of her abhorrent face with ironic grin and sharp predator teeth. Highlight her scaly snake body swirling around the ancient obelisk. white marble, purple fluorite, yellow basalt theme, use hdr and ray tracing to enhance visual impact and create an ultimate masterpiece