"the rewards should ideally reflect aspects such as the appropriateness of a given approach (in terms of the quest itself, the nature of the PC"
So this spell was an end reward for traveling to the plane of Mechanus and safely returning and was the mage focused reward. Nothing said Mechanus magic like this spell and would bring back fond memories of this particular portion of your journey. This captures what RP should to make the experience better...
...bring something unique to your story.
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https://www.youtube.com/watch?v=OKZZEPoVb4c </a>