Tome of Berate  

 

Note: This disc works VERY well with taunt to keep aggro and is instantly reusable. Plan to put it where you can easily reach it and only use it if you are main tank. I am very easily pulling aggro with mobs up to +5 levels from lvl 65 paladains (this was when I was at 58).

It is on it's own timer, so will not interfere with use of other disc. Cost of 200 endurance per use.