Oh, it's grammar! I'm no grammar teacher but I can help considering that by the definition of this power it states: "Once cast, spells seamlessly adapt to the caster's intent and the specific formulae to give it form in any way such as offensive spells can manifest as potent energy rays, elemental manipulations like pyrokinesis, or other destructive forces." Which gives off the intention that despite the spell you're casting it can be modified in order to create something personalized towards you.
This as well gives off the intentions of the fact that you can create spells considering that spell casting can cast spells tailored towards you. It's even in the applications of the said power of "Spell Creation". I hope that was a good explanation.