creature, mindflayer, humanoid, octopus-like head, tentacles, dark purple skin, leather armor, telepathic, casting spell, eerie, underground lair, bioluminescent fungi, damp cavern walls, fantasy, full body shot, dynamic pose, menacing expression, glowing eyes, intricate details, ambient lighting, mysterious atmosphere, 3/4 view, high contrast shadows, detailed texture, Lovecraftian horror, eldritch, slimy texture, wet surface, ominous presence.