-- Deuc
I think you guys may be missing the obvious here... A phys hero does phys damage with EVERY attack. The talent that increases SKILL attack is called Psychic AMPLIFIER. To me it is obvious that a skill attack IS an amplified Physical attack. So of course Physical attack helps skill attack. I've heard this theory so many different ways, but all it takes is to test it repeatedly on same player in arena. I have done this extensively, and have also tested it in WB with blood. Just because he starts with morale over 100 (if runed so) and only does skill attacks unless willbroken does NOT mean he isnt a phys att hero. It just means all of his attacks are (amplified physical) skill attacks. The same holds true for all other physical heroes and their skills...
-- Deuc
then to answer your question, yes I do believe it is worth it. Now, if you do not have vengeance on Adamanti, then he would be my first choice for it, then dawn (only because of his base crit stat)... Then blood. If you run Rhize in form he would also be a good candidate for it but personally i like it on blood over Rhize. Of course most people will have crit on Blood also, and having that extra phys att in vengeance can increase the amounts of his skill attack even more when he crits. In PvP he can be key to defeating these people who start out with adam in front with high HP, doing major damage in first strike... In my opinon yes is definitely worth it.
I ended up keeping the vengence on him, and I agree with you, it was worth it. Though the power loss wasn't absolutely huge, it did affect enough to make me want to keep it on him. Shortly after that post I got rather lucky with frags and picked up my 4th Vengence, so it didn't matter anymore. But, for the people out there scratching their heads over this question, I would recommend keeping one on Blood and Adam before all other heroes.
-- Deuc