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Assuming icestorm acts the same as rain of fire, I would say its not worth the slot. I did some running around seeing what icestorm with no recharge and just a acc/dam and acc/dam/end +4 procs would do. I'm guessing maybe 10-15% chance of a proc firing on initial cast. Very disappointed with even the ragnarok's performance, though I think this purple doesn't have the 4ppm which other purple procs do. Have to play with Overwhelming Force: Damage/Chance for Knockdown/Knockback to Knockdown. Its supposedly a 20% chance, which has to be better odds

Did you mean to split Defenders bastion like that? Might get more bank out of splitting Vigilant Assault into 3s Serious recharge and endu buff x 2. On the winter sets, might consider dropping the dmg/recharge pieces and replacing with procs. They have good numbers with out it, so unless you really want the fire/cold def set bonuses... Working on a Kin/elec myself currently, but he isn't really high enough lvl yet to give you much feedback. But pretty sure I will get hasten a bit closer to when I get fulcrum shift than your build ha it. best o luck!

Ice/ice/ice blaster here. A couple comments on your build. I don't really get the unbreakable guard in Frozen armor, you might be better served with a def set in there. (Unless you really are after the resist cold/fire part of the power). The other thing is snow storm. I prefer Shiver over it. Stronger debuff out of the box. Tempered Readiness Acc/end ,Acc/slo, Change for smashing dmg proc works nice for same 3 slots. Course I'm Ice primary, so snow storm might be better for your hero. And with Frigid protection, how much endu do you really need in stamina? Unless you are really liking that 2nd set bonus, you could probably get away with just 2 slots of perf shifter (endu mod/proc%) Would probably find a slot for hasten, two recharge i/os boosted to max gets you around 91% Recharge in it. Preventive medicine absorb proc maybe in vengeance for some more hp buffer. 2 Slot it with the health/and absorb proc gets you a 2.25 s/l resist buff. Assault is expensive, but two endu cuts are plenty in it, boost to max level at 50 for pretty close the same cut. Damage/disorient proc in chillblain maybe. Looks like a fun build.