That's how it is with me – it's a coincidence, not inspiration. There was a concept that I had about five years ago, but I didn't develop it or use it, and then I saw something similar much later. It's roughly the same as you described with Voyager.
I had the idea to give a similar ability to non-elves. Initially, it sounded exactly as you described, with the caveat that pure auras would have their own bonuses, but then I decided that it would be better if it simply opened access to related areas. That is, red could use purple or orange abilities. This is balanced by the fact that I planned to use a skill slot system, where you have to "memorize" them (and this applies not only to magic), so only a strictly defined set can be active on a quest. That is, the choice for non-elves becomes wider, but the total number of spells is roughly the same. In fact, the original bonus for pure auras was precisely an expansion of the number of slots.
🏹🎪+⛓️♿=💕