[Kameron8]

Black Bolt certainly needs a cooldown, since you can get enough Dark Attack to max out Void Energy with one gate's frayed projectile. And yes, mult-projectile attacks grow out of hand very quickly with refraction. See below:

That's 21 specters worth of damage, the equivalent of 2100% SWA + 1470% Dark Attack + 1470% Wind Attack. It's also trivial to kill people with the Fray projectile, since they ignore Resistance and fire out 4 projectiles that can be refracted.