Okay, I'm not too sure about this here...
The Tooltip for Rend Armor says something like this:
"Damages target's armor for x amount. Can be stacked up to five times. Causes a high amount of threat."
The Tooltip for Devastate says something like this:
"Causes the Rend Armor effect, also dealing X damage per application of Rend Armor"
My question. Does Devastate cause the same threat Rend Armor does? Once you get Devastate, is there ever a reason to use Rend Armor again? Or is Devastate something you should only use to keep a full stack of Rends up on a mob while using Revenge/etc for threat once you have 5 applications of it on the mob?