The query is miswhere and all accents are missing. Not to mention that there is no anonymity of repercussion, because there is also no one for percussion. And not figuratively - which is the most common use - where the closest thing would be irrelevance. But we're not going to discuss this in a badly made query.
The correct term is repercussion, with tilde (meaning consequence). They can be antonym : Cause, origin, annulment, intraens ancestry, nullity, cushioning.