Klingon doesn't have the word "greetings", nor a verb meaning "be noble", so the first part isn't really possible. Klingons don't tend to use greetings like Humans do.
Can you explain what "our bane" is? Is that "things that annoy us"?
If so, maybe something like this would work:
jupwI', nuQwI'ma' watlhchoHmoHmeH DoQmIv'a"e' tebbogh jaghma' 'Iw wIlo'
My friend, we will use a bath filled with the blood of our enemies in order to cause our "annoyers" to become pure