Prism Bolt is the son of Rainbow Dash. He likes playing with storm clouds.

One day, he was playing with one in the wrong place, and, after hitting it too hard, hit his friend with lightning. Now he has to deal with the consequences of giving someone amnesia.

Unless he keeps it secret.
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Written for Kilala97's contest, which you can learn about here: https://www.fimfiction.net/group/201922/kilala97-fan-works/thread/152824/contest

This story, totally serious, nothing silly at all.