fantasy creature transformation, Karlach character, mind flayer features, tentacled face, sharp claws, dark purple skin, leather armor, ominous presence, standing pose, mystical energy, underground lair, dimly lit, eerie atmosphere, stalactites, dripping water, magical runes, telepathic pose, 3/4 view, dramatic lighting, high contrast, detailed texture, sinister expression, fantasy setting, Lovecraftian horror.