The Mark of obedience was a spell that Lucius was highly confident of. And for him, that spell was a must if he were to take in any subordinates that needed to be 'loyal' or servants that would be close to him and know his secrets.
The day he had decided to recruit these three men, Lucius had sealed their fate. They would either all become his subordinates and take up the mark of obedience or they would be freely exterminated by Kiana.
They didn't know that the option of just leaving never existed for them the moment, Lucius stepped in through the door. Even though the three men were experienced killers and had completed many assassinations, they still had nothing on Lucius's preparation and Kiana herself.
While Lucius had shown as if he didn't know them as well other than their names, he had actually spent enough time to research their gifts and weaknesses that came with them. And only after knowing that did he decide to go ahead with this plan.
