CT idea: Bottomless Toolkit
This is just a sprout of a concept rn, I got the idea literally like 20mins ago while thinking of a technique for my OC, so all criticism and ideas are welcomed. (Even the name could use some work)
The base premise: The user can summon a variety of shikigami-natured objects that he can use as projectiles or weapons, and they can follow simple commands about their flight trajectory or stricking speed.
He can summon them anywhere within 2 meters of his body, either from thin air, from his own body or from the ground.
All summons have to fall into a category of "instruments" or "tools" for them to be manifestable. The users of this technique aren't high grade sorcerers, and are usually limited by their own understanding of what all falls under the category of "intruments." Most just end up manifesting big hammers and flying needles and other common junk, and match up to grade 2s or semi-grade 1s in strenght after a few years of training.
My OC is a chef though, and has to live in the streets after his parents disappeared, and he got a new understanding of what all can be used for cooking. He usually uses flying knives and meat hammers when fighting curses, but I plan that in a canon event he awakenes and unlocks the ability to summon pure fire, control heat and be able to utilize the properties of boiling oil, since his poverish life gave him a unique perspective about his technique.
It's almost like Constructual Recreation, except he doesn't need any physical proof of the manifestation he wants to summon, and he is way more limited in what all he can summon, since cars, nuclear bombs and houses can't really be classified as tools.