For 1.09 I would give cold mastery only one point, put one point in energy shield, and put points in static field. My sorc uses frozen orb and static, switching to firewall for immunes. The static field is non timered so it can eat the mana, along with the occasional monster getting a hit on the energy shield, so some warmth is good. Nova definitely can use the warmth.
The Bill of No Rights
The United States has become a place where entertainers and professional athletes are mistaken for people of importance. Robert A. Heinlein
The United States has become a place where entertainers and professional athletes are mistaken for people of importance. Robert A. Heinlein