Superhero inspired by Niu Tou, one of the two guardians of the underworld in Chinese mythology, often depicted as a fierce ox-headed figure. Reimagine him as a sentinel of interdimensional rifts in a future where realms are interconnected yet vulnerable. His attire showcases a blend of underworld aesthetics with advanced rift-tech designs, adorned with shadow motifs. His presence exudes the might of realm barriers. Incorporate a shield that can guard and stabilize any dimensional rift. Colors: realm raven, rift ruby, and sentinel slate. Capture the essence of a sentinel guarding the delicate balance of interdimensional realms.