I would not expect a set skill to have amazing damage but I guess I will go get this as it seems worth it. Can you use beast roar and Siphonic at the same time? If so I could see it being handy in siege. A group of enemies runs in. hit an immune and turn on 2 aoe's that tick and run around like a bowling ball knocking over pins
Haven't tried it in combo, thought I don't remember them being on the same CD so I'm pretty sure it's possible. I don't think I'd use them together, maybe a macro that would chain them to keep the aoe going longer is what I'd do. Would be great for clearing defense that way, especially under fearless.