At the moment, there is a bug with the Mogu Rune of Paralysis - Item - World of Warcraft Mogu Rune of paralysis, you can literally paralyse everything. Rares, elites, Raidbosses, no problems.
Tried it in Mogu'shan vaults on Feng the Accursed, worked wonders for interrupting his Epicenter (Even though that ****s up the timers on DBM badly). Doesn't seem to work all the time though, works about 80% of the time. And it doesn't matter if they're immune to stuns or not. It's just a good old glitchy trinket.
Just thought that I'd share this with you.
//Arth