The information presented here is conjecture based on similar crafts, as none of the parasite crafts are freely available for study.
The parasite crafts are dormant until they are activated by their owners pushing their magic inside of them. An insect will then take a few seconds to form next to the mage, at first appearing as a shimmering shadow suspended in the air. The invocation of one insect is presumed to require a moderate amount of power, and so this could easily be done by
most mages in the empire.
The mage will then be able to continue invoking more insects, each one taking at least a similar amount of magic, possibly a little more every time. Thus, it is inconceivable that many mages would have the level of magic required to invoke a few hundred of the insects, let alone the thousands that were reported. The current theory is that rituals are performed by several individuals so as to enhance the capacities of the crafts.
As reported by His Excellency Heir Jean of House Partesse:
A lot of our people have been missing since the attack started. The perpetrators of the attacks have obviously kidnapped them to power their nefarious rituals and invoke more insects!— Heir Jean Partesse
It is thought that the crafts themselves allow some degree of control on the insects invoked, since some of them have been used for self-defence by the perpetrators of the attack once they were identified. How much control is possible, especially when one craft is linked to more than one insect, is unknown. It is also unknown how long the insects can stay in a physical form after their invocation and whether this requires a continuous magical cost. However, if they are any costs, they are probably offset by the amount of magic the insects consume.
Despite this occasionally use of the insects as a personal self-defence weapon, this does not have a great value for mages with any real battle skills. The interest of the craft lies in their number and their ability to consume magic, as these transform them into a sweeping horde that can be released on enemy Estates where they will devastate resources.
Great article! I also love the pictures that you made, especially the different patterns! :)
Thanks :D I had lots of fun making/finding those images!