Esteemed Elder!

In one of the League of Assassins lairs, two youngsters were facing a door with an eight-digit code. 

"So, what's the code here?" Josh inquired. 

"Normally, this would only be explained to you after you officially joined, but at this rate, you're guaranteed to be accepted. Just assassinating one guy from an A-ranked guild is enough, needless to say 2." The lady in blue explained. 

She slowly walked toward the door. 

"What does this look like to you?" She asked. 

"A door?" What kind of answer was she expecting? 

"Nope. This artifact senses the killer's aura surrounding one's body. It's a disposition that only assassins will ever develop. As for the code, it's just a decoy to sound the alarm. Never touch it." 

Josh couldn't help but be glad that he had decided to take a nap. Otherwise, he would have long been attacked.