what i think is the hinge for directional thinking here is teh word "arrest." english would dictate that it would be accosicated with the lawful arrest of an unlawful person. however, the root word from french strictly means "to stop." once i could determine which word it was, i could progress further in my thinking.
so until then, i shall guess the first chest you find in the northern crater, the item that lets you create your own save point. you are arresting (stopping) sephiroth for the final time, and its an awesome item cause, hell, you can create your own save point location...
unless the item itself "Will end all that I detest."
and im also scraping my mind of when cloud and co. get arrested. i know they do in shinra tower, but i wonder if they do elsewhere...