Yeah it's unlocked. I rolled a mage (mages are OP in every Dragon Age), best early game setup seems to be 2x barrier mage, 1x shield warrior, 1x ranged rogue (Varric).
Worst enemy in the game so far is the terror demon that teleports underneath you, erupts and knocks everyone down, then does AOE damage + slow. Sometimes you have to fight 3 at once. Enemy damage is very high on nightmare so barrier w/ cooldown reduction, tanking, and crowd control is important.