3d realistic character image of a guardian of cyber fortresses in a future where digital realms are shielded by advanced encryptions. His attire showcases a fusion of tortoise shell armor and firewall designs, adorned with encryption glyphs. Eyes radiate with unwavering vigilance. Incorporate a shield that can deflect any cyber intrusion. Colors: green, bronze, and red. Capture the essence of a sentinel ensuring the sanctity of digital domains.