I just found out about this wonderful potion a few days ago, and decided to make sure every one knows about it...
http://www.thottbot.com/?i=14541
Basically it increases physical damage taken on the mob by 8... with a 30% chance of that happening, it debuffs the mob usually every fight.
As a shaman, I use a dagger with 1.3 speed. And since I have the Flurry talent, I get down to a 1.0 speed pretty often, so an extra 8 damage every second is quite a bit in my opinion.
I can't begin to imagine how much this stuff would kick !@#$%^&* for a Rogue that uses two fast daggers though, /drool
And the best part, the materials are pretty cheap. It requires:
1 Arthas' Tears
1 Blind Weed
Both of which, on my server (Dragonmaw), usually cost between 1-2g for a stack of 20.
Let me know if you guys are as satisfied as I am with this, or if you use it already[/url]