I have farmed demons in ashenvale for a couple of hours in order to get this quest item, but so far no results. Checking the item drops list of infernals,felguards,succubus from ashenvale in classic wowhead and i can’t see this item.
I remember the q being there in vanilla, but maybe I remember wrong?
Added in patch 2.0.1.6180, there is always notification when something was added to the right on wowhead. “Quick Facts”
So, don’t kill yourself trying to do undoable, and enjoy the game