[Lumix]

I agree about squall skill... is one of the best skills in the entire game... when it (and the sinergies) is maxed out, you just almost completely disable ranged attacks (casters and archers), which is crucial in legendary. Besides, squall damages enemies and more importantly, lowers their resistances so you (and your pets) hit them harder. On top of that squall tree also reduce the damage your enemies do on you.

Also, otherworldy power is very useful in high levels. I'm using it a lot in my Conjurer, keeps my mana high and increases dps a bit, while only losing 500 hp or so each time I cast it.