How did the little brother sent by Assassin's Creed Apocalypse System kill him? Now it's all 14.

Why did you kill him? What's the use of doing this? Is it to complete the task of recruiting 12 novice assassins? If yes, the system sends assassins, then only 1 1 can be recruited, but once an assassin becomes a master, he is invincible (unable to kill), but there are only seven masters, five of whom are always at 10 level. Just send a master to do the task, and then go to the guard camp to summon the assassin, and the assassin 10 level will come out.