1: You have stated he is a leader but he doesn't have any leader abilities.
I'd make this a power rather than an aura; Snap Repulsion is plenty melee defense as it is. How about:Noticced the lack of a leader power... Quickly thinking of something for you. How about this:
Force Field Aura 2
Any enemy moving inside the aura treats it as difficult terrain.
Any ally making attacks inside the aura receives a +2 to damage.
I think it's intentional: the rest of his defenses look rather high for his level (although I'd give him a 19 Fortitude and 17 Reflex myself), so this is a way of balancing. He's an expert in magic, but terribly squishy against weapons.2: His AC seems a little low to me, I would have expected an AC of 20 for a level 6 controller.
This guy is going to destroy melee characters. Keep Repulse as a burst 1 with a3: His damage output is either low or medium, with very little actual control. I would consider the following chanages:
Iron Rod (standard, at will)
Attack +11 vs. AC; 1d6+4 damage; on hit target gains vulnerability 5 force (save ends)
Battering Blast (standard, at will) force
Range 10/20; attack +10 vs. Fortitude; 2d6+4 force damage; on hit target is pushed 3 squares and knocked prone
Repulse (standard, at will) force
Burst 3; enemies only; attack +10 vs. Reflex; on hit target is pushed 1 square and knocked prone
Every ranged guy needs one of these.4: I really like Snap Repulsion, its a great power.
I was considering this power to add to the Force Mage, or the Empowering Field idea suggested by Dire Human:
Force Aegis (standard, encounter) * Force
Targets the caster and one ally, or two allies; the target gains a Force Shield, granting Resist 3 all, immunity to forced movement, and the target's space cannot be occupied by any other creature. A minor action may be used to sustain one Force Shield, or two minor actions must be taken to sustain both Force Shields. When a Force Shield is removed, a Repulse attack is made from the target's square.
Repulse being the same power stated in my original post.
This guy is going to destroy melee characters.