Raven didn't want Marquise Colombore to die. That wasn't a part of his plan.
He wasn't planning on killing any of the neutral nobles, as they hadn't done anything wrong. They were merely people who didn't want to fight because this fight had nothing to do with them.
Yes, they were ignorant for thinking like that, but ignorance didn't warrant death.
He was going to brand them all with his personal slave seal, and although it made him no different than the demons, he wasn't trying to make them his eternal slaves.
He was merely trying to ensure that he wouldn't get betrayed when the war started in earnest.
Now, however, things had taken an unexpected turn.
As said before, he didn't want Marquise Colombore to die, but now that he was dead, he couldn't deny the profits it would bring him.
With that one death, Raven would gain people who would be willing to fight the demons along with him and would be loyal to the cause.
