Pretty much - my wizards can manipulate only that which is already there.Knacks are a cool name for this!
I imagine then, your wizards can only manipulate that which is already there? You mentioned the classic fireball being out. Pyrokinesis would imply moving fire which already exists, right? Although you also mentioned igniting things at a distance. Hm...
I'm also curious now, since you imply that your wizards don't just...generally have ability to work anything within their knacks (Kyle, a beautiful name, has a knack for Fixing, but you also mention specific spells), do your wizards need to say or do anything to work their specific -kinesis magic? Like an incantation or special movement?
Much of the telekinetic 'spells' are applied visualization. To 'fix' - to bind things together, the wizard sticks the things together and imagines them 'bound' at the 'grain of sand/splinter' level. For lubrication, a drop or two of fluid is envisioned to spread out and cover the entire surface. Shatter involves imagining all the minute cracks and flaws in an object, then applying telekinesis to make those flaws rapidly expand. Each application requires a different visualization, making it a different spell, so to speak.
With pyrokinesis, the key is friction - like rubbing sticks together produces heat, then eventually fire, except, again, this is envisioned at the grain of sand/splinter level. How far away s fire can be ignited depends on the wizard's telekinetic reach, for many this is measured in inches, for the likes of Kyle, it is a dozen yards.
Whether a verbal component is involved depends on the wizards training and exact spell being cast. The more competent wizards don't bother.
Added to all of this is the 'philosophical limit. PSI ability, if abused, can and does fade away. 'Abuse' constitutes things like casting spells to harm others without damn good reason (usually a life or risk of serious injury) or casting spells for coin - specifically healing spells, though there are others. There are...philosophical approaches that permit workarounds, but well... Anyhow, most wizards are either attached to an academic/;;beneficial organization, subsist on the charity of others (villagers giving them a hut and food in exchange for spell work and other services, or a lord giving a spot in his manor.) or are effective hermits (classic reclusive wizard in a tower).
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