I'm already soloing everything but the dungeons with ease. I'm not maxed gear either. I do this awesome thing where I press the SHIFT key and step my big dragonborn hide out of the red circles on the ground, and I step away when the mobs do their slow-motion drawback that telegraphs their hard hits for an hour before they…
I'm having the same issue. No unstoppable, and can't slot it. It is connected to allocating powers somehow. When I don't put powers in after a respec (wasted two to figure this out), I have unstoppable and it works. I put a few points in my powers, and I lose it from my toolbar. Hope this helps, devs!
Anyone else having the mechanic power (the tab button by default) unusable? I can't even slot unstoppable into it and I'm crippled as a GWF without it.