http://www.guildwarsguru.com/skill/203-holy-wrath
"While you maintain this "Enchantment", whenever target ally takes attack damage, this spell deals 66% of the damage back to the source (maximum 5-17) and you lose 10 energy."
Does the enchantment end if you can't pay the 10 energy? It doesn't say in the description on this site, and I don't have the skill yet.
I was thinking of trying it with my Wa/Mo in PvE for farming. Basically, I toss up Mending and Holy Wrath, then wade through crowds of stuff that has trouble doing significant damage to me. (I have a lot of absorbtion, and I'd spam Watch Yourself too)
Maybe a little Bonetti's Defense + Symbol of Wrath too.
Z
