Well, people seem really interested!
Great guide, although I disagree with you about the usefulness of Gale over that of O2. Never taken it and never will (prefer to concentrate on my other debuffs and not worry about healing)... although this is my personal view.
Also, I have found Thunderclap to be useful used straight after Freezing Rain, or stacked with my sonic disorientate (or the Dark equivalent).
Lightning Storm, while not being a great damage power, is good at taking some of the heat off you when you need it.
I havent plated these two powers together but I've played them both separately a fair bit. From a PvE point of view, I would slot a few powers a little differently.
Steamy Mist has quite a low base +Def. I prefer to slot with Dmg Resist instead of Defense Buffs.
Freezing Rain I liked to use as much as possible so I would put 3 recharge in and the other 3 Slows/Def debuff to taste.
Hurricane - I take it you mean end reduction rather than acc reduction?
Tentacles does almost as much damage as Dark Blast in a nice handy cone. I prefer 3 damage in there although I can see how the immob would be useful for PvP.
Octavian Vanguard
@ohmsEU and @ohms 2
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I havent plated these two powers together but I've played them both separately a fair bit. From a PvE point of view, I would slot a few powers a little differently.
Steamy Mist has quite a low base +Def. I prefer to slot with Dmg Resist instead of Defense Buffs.
Freezing Rain I liked to use as much as possible so I would put 3 recharge in and the other 3 Slows/Def debuff to taste.
Hurricane - I take it you mean end reduction rather than acc reduction?
Tentacles does almost as much damage as Dark Blast in a nice handy cone. I prefer 3 damage in there although I can see how the immob would be useful for PvP.
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Ah yes thank you...and I didn't know what the defence on SMist was like, so thanks for that too 
Can I state that Thunderclap is more useful for Controller. I also find Gale to be quite useful at times, and only use my heal as an emergancy.
Ironically, Storm Summonning works best in confined spaces. using Gale outside will blow your enemies apart, while using it indoors (especially in cave maps) will keep them together, just further away.
Steamy Mist does have pitiful +def, so slot it for +res instead. 3 end reducer things seems a bit much.
Slot Freezing Rain for recharge before you slot it for anything else.
The recommended slotting of freezing rain should be
3 recharge, 1 endurance or
3 recharge, 1 endurance, 2 slows
A Paragon Defender
Why does everyone suggest recharge? Mine recharges fine!
I have hasten, but I'm sure some of you do aswell
...
A lot of the attack powers seem devoid of acuracy, but I've not played the combo
"Well, they found my diary today.
They were appropriately appalled
at the discovery of the eight victims
They're now putting it all together.
Women wrapped in silk
with one leg missing
Eight legs, one body, silk,
spider, brilliant!"
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Why does everyone suggest recharge? Mine recharges fine!
[/ QUOTE ]It's resitance debuff, the more you have, the better.
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Why does everyone suggest recharge? Mine recharges fine!
[/ QUOTE ]It's resitance debuff, the more you have, the better.
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damn straight
A Paragon Defender
Yeah but...I'm sure it was Def debuff....either that or I couldn't slot it for res debuff...
Seriously the main reason for this power in the PvE game is its res debuff and since you cant slot for -res(no power can) you have to slot for recharges to have it up more. This power can increase the damage from the team alot, more when you get the defender version and the controller get their own version back.
50s
controllers: Ill rad , grav rad, fire kin, ice kin
blaster: ice em
scrapper: spines sr
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Yeah but...I'm sure it was Def debuff....either that or I couldn't slot it for res debuff...
[/ QUOTE ]It has both -Def and -Res, but there are no -res enhancers.
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Hurricane
Toggle: PBAoE, foe -range, -accuracy, knockback/knockdown, repel
Sorry, another endurance drainer, but also another must, even at lower lvls. It makes you melee proof in PvP, and if you can keep up, can also be Blast proof. It was also a must for me, because who I'm based on, and my urge to RP.
Slotting Advice: 3 ToHit Debuffs, 3 accuracy reductions
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How does it make you blast proof?
My MA IDs:
Fiend Space: 211464
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Hurricane
Toggle: PBAoE, foe -range, -accuracy, knockback/knockdown, repel
Sorry, another endurance drainer, but also another must, even at lower lvls. It makes you melee proof in PvP, and if you can keep up, can also be Blast proof. It was also a must for me, because who I'm based on, and my urge to RP.
Slotting Advice: 3 ToHit Debuffs, 3 accuracy reductions
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How does it make you blast proof?
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I think what he means is that a Blaster's blast will keep missing you if he's held in a corner. 
as long as you can keep up with them, I use TP and it's great for it, they can't touch ya!
Don't know how the other Travel Powers will work, I had to choose TP...
Blasters with SJ manage to keep away though..
My thoughts 
freezing rain. 3 recharge, 2 defence debuffs ,1 slow. Its a great opener to a fight as u can hide round a corner and still use it. great with snow storm as already said.
Snow storm. 3 slow and 2 end red. This power is a must for PvP. what most people dont realise is that in PvP it stops all powers that can be interupted. blasters snipe heal self etc. it rocks 
I have it with my ice blaster and its great fun watching people try use heal self and snipe.
thunder clap. 1 acc, 2 recharge , 2 stun. Yes its great in PvP ,its a must in PvE aswell. Will stun all minions in Aoe.
Can be risky to use as it means you getting in the middle of things. But if u use freezing rain first it lets you use tthunder clap with ease.
Don't listen to her :P
With Rain properly used, you don't need the Clap, which will probably miss all of the buggers, including the underlings. However, anything that does hit will be stunned for a massive half second!
Don't get it. Storm is a very fast lvler in my opinion, and I could've done it a lot faster if I had a plan, and didn't take stupid moves and gone kamikaze style. People that I team with regularly (eg SG members) know me for dying more than anything else. On fun characters, like my current villain, I have no problem with debt. It's fun. But if you wanna launch to 50, forget Thunder Clap.
Well depends... in PvE thunder clap isn't that great but in PvP it is rather nice to have an AoE toggle drop... makes storm even more overpowered than it already is , hehe...
mm still don't want it...
Im prolly with Chi on this one. Thunderclap isnt that good. Sure it can toggle drop, but so can lightning storm. And I actually think Lightning storm is the better knocker of the 2 powers. Lightning storm has 50% for each blast (and it has 12 blasts Iirc). I cant remember how good thunder clap is. I think its 100% chance for first + some chance for additional toggles.
And its not that good in PvE. With my fire/storm troller, I keept trying to get flashfire and thunder clap to work together so I could hold the bosses too. It actually didnt work very well cause the animation time is far too long. I would get smacked down before thunderclap fired.
Sure it would help if I actually bother to get the epic shield. It uses too much endurance and I hate the fire sound (fire mastery cause of concept).
There is also a different matter. In the old days (not so long ago), it was autohit. Now I have to use 2 more slots on it (2 acc). 4-6 slottting something of minimal use isnt really me.
Next problem is actually using the power with hurricane on. Everytime I try to, the mobs are out of range before they are held unless I push them to a corner.
Oh, and there is a last issue too. I cant tell how big the range is. It seems smaller than flashfire which makes stacking harder.
A Paragon Defender
Thank you. SOMEone has some sense
can i just say this guide is pretty sweet chi, ive been thinking about making a storm defender for ages and i am defo gonna be taking your advice on board
Hey y'all, probably thinking that most of you haven't seen one of these around, as I don't think there are many people of posting one!
Anywho, after seeing my good friend Irradiator's Rad/Rad guide, I thought I should make the effort, just to show him up.
I know many of you think that Storm is not a very useful Defender set, and those people may be right, to a certain extent. This certain extent, however, is the very short end of the telephone line.
The Storm Summoning set is fantastic in every way in my honest opinion. It is one of the most useful sets I have ever played, as it has a very 'Controllerish' feel to it, which makes it perfect in PvP, and why */Storm Controllers are simply amazing.
Many of the powers are just as good as holds, if you combo some of them up. eg. Freezing Rain + Snow Storm = Gasps from teammates.
Now, onto the good st00f. I have used every single respec given to me on Chi, and I think I have come to the right one, even if it is more around PvP, I can still Solo with the rest of 'em. Don't make the mistake that I did with two of my respecs, don't get all the Storm powers, or all of the Secondary Powers, as quite frankly, although most are great, you don't really want gale, do you?
OK. My Stormy was based on the ever-annoying Tsoo Sorcerer. Two of them are pretty much impossible to beat on your own now aren't they? And they don't even attack properly.
I had always loved these wonderful villains, and after hitting 50 on my Scrapper, and after my few months break of CoH, I finally made what I thought to be the most fun character ever to be created...mua ha haha...ha (sorry, had to)
OK, this is a review of the powers, from both sets.
STORM SUMMONING
Gale
Ranged (Cone), Minor Damage (Smashing), Foe Knockback
OK, this may be slightly useful in the lwoer levels, until you get some other knockback powers, but I believe it is a waste of a good move, when you could be getting your heal straight away.
Slotting Advice: 1 Accuracy
o2 Boost
Ally Heal, +res (Disorient, Sleep, End Drain)
Admittedly, it's not Absorb Pain, but it's still useful if you're the only healer around, or in PvP -> Be warned, will be hunted down if caught using it! Its also useful for the Endurance Drain Protection, and for anti-Disorient (very useful for awakened Heroes). I know it's not the best power in the set, but it sure as hell is a lot better than gale!
Slotting Advice: 3 Heals, 1 Recharge
Snow Storm
Toggle, Ranged (Targeted AoE), Foe -Speed, -Recharge, -Fly
One of the greater powers of the set. It can be a bit of an endurance drainer before Stamina/SO slotting, but worth getting when you can afford to. The immense slow is great for keeping people put in PvP, and is a great way to keep a mob of enemies together for a nuke or more AoEs. One of my favourites.
Slotting Advice: 3 Slows, 2 End Reducs
Steamy Mist
Toggle: PBAoE, Team Stealth, +Def (All), Res (Fire/Cold/Energy/Confuse)
Again, it can be a bit of an end drainer at lower lvls, but a life saver in the higher ones. It also makes stealthing a lot easier, depending on the travel power; although you have to keep moving. A must for 20+.
Slotting Advice: 3 End Reduc, 3 Defence Buff
Freezing Rain
Ranged (location AoE), Minor DoT (cold), foe -speed, -recharge, -res, -def, -recharge.
This is great, even at low lvls. It doesn't cost that much endurance, is a great way to show off, and does a lot to save your team. With Snow Storm, you can keep enemies in there for as long as the Rain lasts, and the recharge isn't that bad either, although, I do always pick hasten when I can perma it. It doesn't say it in the description, but it also has fantastic knockdown, which will keep them in it even longer, it seems to be almost as good as earthquake.
Slotting Advice: 3 Defence Debuff, 3 Slows
Hurricane
Toggle: PBAoE, foe -range, -accuracy, knockback/knockdown, repel
Sorry, another endurance drainer, but also another must, even at lower lvls. It makes you melee proof in PvP, and if you can keep up, can also be Blast proof. It was also a must for me, because who I'm based on, and my urge to RP.
Slotting Advice: 3 ToHit Debuffs, 3 accuracy reductions
Thunder Clap
PBAoE, Foe Disorient
I took this power for a while, but respecced it out ASAP. Yeah, it looks cool, but it's too inaccurate, and the range isn't good either. I found it put me in too much danger, for too little reward.
Slotting Advice: 3 Accuracy
Tornado
Summon Tornado: PBAoE Minor DAM (Smash), Foe Knockback, Fear, Disorient.
This may get annoying to some Scrappers or Tanks, which is the reason I respecced it out for a while. It is simply amazing for PvP, and is simply a life saver when soloing, or with ranged players only. It should only really be used as a last resort though, as it will completely destroy AoE hopes, and may stray off and aggro other mobs. It has about 10 seconds downtime with Hasten.
Slotting Advice: 2 Knockback, 2 Disorient, 2 Defence Debuff.
Lightning Storm
Summon Storm: Ranged, High DMG(Energy) Foe -End
Woo! Well, a smaller woo now, ED completely ruined it. 6 slot damage was a-ma-zing. Another life saver, with the knockback, and probably the best damage output over time. Uses a hell of endurance, about 40% infact, but that can be fixed, and seeing as it's not a toggle, it's not really a problem unless mid-fight.
Slotting Advice: 3 Damage, 1 Endurance Reduc.
There you have it, a complete guide to Storm. Now, for those Tsoo lovers, onto the Dark. Not only does it look cool, but the accuracy debuff seriously helps with everything, and with a melee user, any attacks with Hurricane makes you pretty much an Ice Armour/Katana/Super Reflexes/Force field user!
Dark Blast
Dark Blast
Ranged, Moderate DMG (negative) foe -accuracy
Well, you have to get it, so don't moan It's not that bad, OK Damage, good for finishing someone off. But if I could choose against it, I probably would
Slotting Advice: 3 Damage, 1 ToHit Debuff
Gloom
Ranged, High (DoT Negative) foe -accuracy
A lot better than dark blast, even if it is DoT. Decent damage and good accuracy Debuff. Me Likey.
Slotting Advice: 3 Damage, 1 ToHit Debuff
MoonBeam
Sniper, Superior Damage (negative) Target -Accuracy
What can I say? It's a fairly decent snipe, can get it at a low lvl, although I'd probably go for the Storm /Primary powers first.
Slotting Advice: 3 Damage, 1 ToHit Debuff
Dark Pit
Ranged, targetet AoE, Foe Disorient
Pretty much the same feelings of it as ThunderClap....very low accuracy, even on blues, long recharge...naah, don't want it.
Slotting Advice: 2 Accuracy, 1 Disorient
Tenebrous Tentacles
Ranged (cone) Moderate DMG (Negative/Smash), foe immob, foe -accuracy
Come on, am I really gonna say no? It's one of the best powers in the set, and is good for keeping enemies in AoEs etc. The accuracy debuff isn't to bad either.
Slotting Advice: 3 Immob, 1 ToHit Debuff
Night Fall
Ranged (cone) Moderate damage (negative) foe -acc
Night fall is a pretty good cone move, and does good damage. Looks great, and can make a good chain attack with itself, gloom, and dark blast.
Slotting Advice: 3 Damage, 1 ToHit Debuff
Torrent
Ranged (cone) Minor Damage (negative) Foe -accuracy, knockback
No, don't even think it. Worse than gale. I refuse to talk about it any longer. Case closed, see you next week.
Slotting Advice: 1 Knockback
Life Drain
Ranged, Moderate Damage (negative) foe -acc, self +HP
I took it only because I didn't have a self heal. Again, a lot better before ED but it is still cool and useful to have. Wouldn't recommend for Empath/Dark Miasma/Kinetics, as they can already heal.
Slotting Advice: 3 Heal, 1 Acc
BlackStar
Close (AoE) Extreme Damage (Negative) foe -acc, self -recovery
I almost liked this at one point, but respecced it out after a few weeks. I loved the damage, but I now think that -recovery isn't good for defenders, as they're supposed to keep their team alive, which is hard when you're resting.
Slotting Advice: 3 Damage, 3 ToHit Debuff.
There you go, you'll never ever ever ever need another post about this again. I hope it helps, and I would appreciate advice/corrections from any other Storm Summoning or Dark Blast users out there.
I also think I should put in, that this was and is by far the most fun character I have ever made. I still play him in mishs and PvP all the time, long after the big ding, and I would love to see other Stormies out there.
Bye!
Edit: Oh yes, almost forgot!
My travel powers: TP Friend, TP Foe, TP self
Mastery powers:
Energy:
Total Focus (High Damage Disorient)
Conserve power (The saviour of the Stormy's endurance)
Temp Invul (The saviour of the Stormy's life, and once again,the end to the Stormy's endurance!)