Spirits are entities originating from other universes (Eternities). From the seventh Eternity come angelic spirits. From the sixth Eternity come demonic spirits. From the fifth, fourth, third, and second Eternity come elemental spirits (sylphs, salamanders, fairies, and elves). All spirits can visit the first Eternity.
From the first Eternity come the ministering spirits, who are mortal like all living creatures of our Triarchal universe. (Details on these topics you can find in Chris Cal's book "Journey to the True Universe")
According to tradition, magicians mainly invoked demons and spirits and forced them to fulfill their wishes. Immediately afterwards, they would cast them out because it is dangerous for anyone to coexist with spirits in the Triarchal universe.
The difference in the behavior of subservient spirits is that they voluntarily cooperate with the wizards and witches of their choice.
These spirits seem to bond with the people they serve to the point that their services go beyond the bounds of duty, and they remain with their masters in our familiar Triarchal world, even though here their lives end much more quickly.
The church claims that the original essence of the adjutant spirits was demonic entities, sent by the devil, with the mission to protect and help wizards and witches evolve. In practice, however, the adjutants are not on the side of good or evil, but it is in their nature to serve man, which determines in which direction they will move.
Subservients, in their original form, are vague like shadows, but they can take the forms of animals, mainly choosing to transform into cats, dogs, rats, bats, and, in some cases, into spiders, snakes, lizards, or owls.
The subservient spirit chooses the person it wants to serve, and no invocation guarantees that we will bring such an entity to our service. We can, of course, try to invite it by staying in the countryside during a night of a new moon.
To perceive a subservient, we walk at night in the countryside with our attention on the right edge of our field of vision, without turning our head in that direction.
When we perceive a shadow following us, controlling our fear - which must be present for the spirit to be perceived - we continue walking, turning our heads slowly to the right. After a few minutes, when we see it appear better, we stop abruptly and welcome it, asking for its name.
The spirit will respond mentally (without sound) but absolutely clearly. We will then address it by its name and tell it that if it wants to follow us, we have no objection.
In this process, we are not in danger from the entity. It does not want to harm us, but even if it wanted to, it could not. The risk we run is that fear will overwhelm us and either accidentally injure us while running in panic, or we will freeze in fear and remain motionless, possibly even causing cardiac arrest.
Before we attempt such a venture, we must learn to control fear and, by strengthening our faith, gain a loyal friend who can help us everywhere.