There are 1 & 2 Star mobs in all zones, but they are usually rare, and very obviously a different color, but as Blue said it does not ramp up. Be really careful near plains or mountain borders, those mobs can and do run into the Forest to a certain point.

Also keep in mind there is more than 1 type of Greydwarf out there, so be careful. If you need more help, talk to Blue above me.

Unlike the meadows, you also now have to deal with mobs that fight at range.