Explore the concept of Death's Familiar in a dark fantasy style. Embrace gothic aesthetics, macabre details, and haunting atmospheres to create a composition that is both eerie and captivating. Focus on capturing the mysterious and otherworldly qualities of Death's Familiar, infusing the artwork with a sense of foreboding, intrigue, and supernatural allure. Delve into the realms of fantasy and imagination to depict Death's Familiar as a powerful and enigmatic entity that exists beyond the boundaries of the mortal world.