A lot of evil spirits snuck out using this loophole of being summoned by Otherworldly beings, but once they committed a crime without benefiting Hell at all, their punishment would be doubled.
It was true that the spirits could wander outside for quite a time compared to the other creatures who were more strictly controlled by Heaven or Hell.
But it's not that simple.
Despite being able to wander outside of Hell, spirits aside from the high-level spirits could do nothing without shamans and their level of threat was definitely way less than the other creatures.
Both Lucifer and Archangel Michael wanted to fish out as many special spirits with those unique abilities as possible and let the soldiers who could remain outside of the gate destroy the domain cores.
Because the holy spirits were tricked by Ainsley and they still didn't realize it while Ainsley and her evil spirits had finished searching for what they wanted to find...
