I'm not sure if it's just me but sometimes GA dmg doesn't even seem to hit or register. I think taking obliteration is a DPS increase until GA is fixed. It just seems too unreliable right now. I've had many times where i mob just happens to move out of the way when I cast GA and there you go wasted cast and no dmg at all. Paired empowered runic weapon with obliteration seems like it work incredibly well together. I'd love to hear some thoughts and peoples experience with these talents