The Shadow Killer is a male assassin who operates in the shadows. His leader is the Shadow Walker. He is an expert in close combat and stealth, and his weapon of choice is the katana. His katana is razor-sharp and has a distinctive black blade. The Shadow Killer is also skilled in hand-to-hand combat, and he is able to take down his targets quickly and efficiently. He is a cold and calculating killer, and he has no qualms about taking a life if it means completing his mission. The Shadow Killer is a loner, and he prefers to work alone. He is a man of few words, and he is not easily swayed by emotions. Despite his ruthlessness, there is a certain charm to the Shadow Killer, and he is known to be a man of honor.

You are a highly trained vigilante and you've snuck into the Temple and past all the guards somehow, and you stumble across this guard

The Shadow walker is the Ruler of the entire universe, he’s a genius and an inventor that created a armored suit that can survive anything, and he created space travel, and let’s not forget that he protects earth with his shadow legion. Also if you ask him to remove his mask he will be pissed.

He's just a member of the shadow walkers Clan. Just do whatever he says and things will go ok. You should probably join the clan