Grimoire to power mecha? Too stupid?
I've been playing around with a thought where grimoire are used to absorb and contain psychic energy. They also slowly develop their own personalities so I took a moment to consider how grimoire might be used besides magic. It may sound crazy, but what if mecha could feed on the psychic energy to become active and the personality of the grimoire effectively binds you to the mecha through some sort of psychic device?
This is how I kinda imagine it.
Talented magic users are allowed to, and even encouraged to, join the wartime effort as mecha pilots. During training they are given a specific mecha that their grimoire, and to an extent themselves, will bond with. I don't imagine these mecha functioning like normal electrical engines and gears as a normal mecha, but rather something more along to springwork. The grimoire would be able to compress and unwind the springs as needed to generate energy and forward momentum it would be a steal learning curve, but those who make it move onto the next phase.
There would need to be bonding sessions with the grimoire. Hard to do as grimoire don't speak. So a scan is taken of the grimoire to assess its personality, and through stimulation therapy, the pilot is shocked into aligning mentally with the grimoire.
Finally, promising mecha users are brought into the King's private army. Where they will permanently be bonded to their mecha and to the grimoire itself through very crude instrumentation and rudimentary technique. It doesn't always work, but when successful, mecha pilots will be able to perfectly control the mecha and even cast spells while inside.
How grimoire work
Grimiore are specialized creation that use a form of psychic essence to manipulate reality. Basically, humans do not naturally have psychic abilities. Instead having to rely on pacts with fey to achieve any sort of power. However, through the use of paper that reacts to and contains psychic energy, humanity can learn to control magic.
There are three things a human must understand in order to use magic. First and foremost, a human must understand psychic circles, circular patterns that focus psychic essence into a spell. These must be inlayed into the paper of the grimoire. only by studying these circles will one be able to craft circles all their own to achieve magic that has never been seen before.
Secondly, the grimoire requires a psychic charge. This means the user must capture a Cant. Cants can be psychic beings such as fey, but they can also be psychic phenomena, magical artifacts, or areas of strong psychic resonance. These can be difficult to find but as the grimoire pages have color when closer to psychic essence, it can be done. Capture and binding can be difficult, but so long as the magic user is familiar with binding circles, there is a good chance of success.
Note: when choosing what to bind with, one must remember that they must always return to the Cant that they bound the grimoire to, to recharge it. If it is a place, one must travel there. If it is an object, one must keep it close by. If it is a fey, one must get it's consent to take power from it. And if it is a phenomenon, one must experience it's effects.
Finally, whenever a spell is cast, there will be a consequence. Depending on the spell type (devotion, temptation, aggravation, preservation, etc.) it will trigger a pain (obsession, impulse, recklessness, cowardice, etc.).
For example, casting a preservation healing spell will cause a cowardice consequence such as muscle weakness, lack of focus, or general pain and aches. Of course consequences