In one of the buildings inside the Croel Family Compound, very few servants were inside
This building was previously just a normal one but now, it was far from being normal
It was the house that was used to lock up Aleister, the Prince of the Vampires
As a result, a lot of sealing formations were cast on it. It prevented both entering and exiting
The servants inside the house need permission to enter and exit it. After all, there is an extremely dangerous creature inside
Due to Aleister's injury, he has less than a percent of his power. Even then, it took a lot of effort for the Croel Family to subdue him
That is only considering Aleister's extremely weakened state. Just what kind of power would he have at his peak?
Thus, the security in the Prince's 'dwelling' must be secured. Outsiders must be prevented from freeing him while the people inside should be prevented from doing the same thing