All forms of rend, that I have seen, state that rend is additional damage. How is this additional damage applied? Is the "additional" damage added to the damage of the triggering attack, both attacks or is it separate damage as though it is a separate attack all together?
The relevancy of this question comes in to account in how it reacts with DR. By the description of the ability the two attacks combine to tear the flesh essentially making it one massive wound. I doubt both attacks and the rend damage combine for one solid hit, however that is how the wording makes it sound to me.
As always any material references via copy and past, links or sections/page numbers are preferred and appreciated in supporting your answers.
In Addition for purposes of Power Attack would rend qualify as melee damage and grant additional damage?