I used search and didnt find this, so i hope its not a repost, at least i didnt see it posted here.
There is a paladin ability: Shield of Righteousness, which you get at lvl 75, and rank 2 at lvl 80.
The bug is, that Rank 1, dont trigger CD on Rank 2 and vice versa, so you can use it for additional damage and threat.
I think that some people already knew this, but some didnt for sure, and i wanted to share it for the ones who didnt know yet)
P.S. Sorry for my English