Noun
One who injures or wrongs.
Source: Webster's dictionaryThe problem with revenge is that it never evens the score. It ties both the injured and the injurer to an escalator of pain. Both are stuck on the escalator as long as parity is demanded, and the escalator never stops. Lewis B. Smedes
Let the injurer not forget. Italian Proverb
The injurer never forgets. Italian Proverb