The descriptions says a fire enchanment is added to all physical attacks. So what exactly does this mean? Also, NC should set this skill to 10mins (to match Battle Roar) or 20 mins (to match buff cycle). It's a darn nuisance to have to keep track of 3 different cycle times.
note: it takes off holy weapon buff and a new holy weapon cannot overbuff it, so you wont want to use it in an area with undead or sacred weak mobs if you have a holy weapon buffer. Ive heard that even on mobs that aren't weak to fire it will still add a bit more damage, but beware- if you attack fire resistant mobs it will reduce your damage (just as if you attack holy resistant mobs with holy weapon buffed)