Attribute points
Since this build is lacking in HP department go all to physique.
Grim calc
http://grimcalc.com/build/1008-AqU4XK
Since demo mastery tends to bug on grim calc from time to time, or from patch to patch here is a picture of demo skill mastery:

Devotion binding: Reckless tempest - Termite mines; Arcane bomb - Flashbangs; Elemental storm - Obliteration; Healing rain - any aura
Why so defensive devotions? With recent changes to the game, to be able to perform in crucible almost all builds are pigeonholed to use defensive devotions. If you dont plan to do crucible with this build you can use more offensive setup but I still recommend taking tree of life because of energy regeneration it provides.
Why star pact and not reckless power? Dont you need casting speed? Casting speed is nice but with taking reckless power instead of of star pact you will not get almost any dps boost, cuz star pact gives bonus % dmg to lightning and electrocute, your primary dmg types and that bonus fully compensates for casting speed bonus of reckless power. Also whit out starpact you would lose fear chunk of your tankynes.
How does exactly star pact makes this build more tanky? - Star pact beside of giving % dmg bonuses to certain types of dmg gives CDR reduction to all skills, not just active ones. So with the help of star pact you have pretty low CD on skills like blast shield and mirror of ereoctes and no CD at all on healing rain proc. That makes this build extremely tanky.
Not to mention that you also have reduced CD of your offensive procs like elemental storm and specially reckless tempest that is perma up.
Some pictures to see CD on certain skills/procs:



Is this build going to be nerfed in upcoming HF? Well Zantai promised it will not, but since he has some strange nerfing fetish one can never know 
Alternative less gear dependent setup of the build
Since most of people here aren’t hard core players ready to spend hundreds or even thousands of hours farming for gear I prepared less gear dependent setup for them. This setup doesn’t require any hard to find/craft MI/green item:

Skill points distribution is same as for setup with MI items. If you want higher stun resistance invest some more points into conversion.
Important thing for you to know is that there is not to much difference in overall performances of those two proposed setups, no MI setup can do the same things like MI setup tho bit slower but its also a bit tankier than MI setup.
Gearing
Offensive vise you are searching for items that are primary giving % to lightning/electrocute, casting speed, OA, % dmg to fire is also welcome.
Defensive vise try to cap resistances, get enough armor, HP, DA,…
I find 3pc light defender set to be the BiS cuz its giving offensive and defensive vise excellent stats and it helps a lot in energy management.
Currently equipped gear
I will list the gear used for no MI setup of the build cuz I find it more newbie friendly and people that played enough to have good MIs will know how to make MI setup with out me helping them.
Head: [Clairvoyant’s Hat](http://www.grimtools.com/db/search?query=Clairvoyant’s Hat) ([Leathery Hide](http://www.grimtools.com/db/search?query=Leathery Hide) / [Mogdrogen’s Touch (Devil’s Crossing)](http://www.grimtools.com/db/search?query=Mogdrogen’s Touch))
Shoulders: [Light’s Defender Epaulets](http://www.grimtools.com/db/search?query=Light’s Defender Epaulets) ([Scaled Hide](http://www.grimtools.com/db/search?query=Scaled Hide) / [Mogdrogen’s Touch (Devil’s Crossing)](http://www.grimtools.com/db/search?query=Mogdrogen’s Touch))
Chest: [Light’s Defender Plate](http://www.grimtools.com/db/search?query=Light’s Defender Plate) ([Kilrian’s Shattered Soul](http://www.grimtools.com/db/search?query=Kilrian’s Shattered Soul) / [Kingsguard Powder (Black Legion)](http://www.grimtools.com/db/search?query=Kingsguard Powder))
Main hand: Warpfire ([Imbued Silver](http://www.grimtools.com/db/search?query=Imbued Silver) / [Creed’s Cunning (Black Legion)](http://www.grimtools.com/db/search?query=Creed’s Cunning))
Offhand: [Tome of the Arcane Wastes](http://www.grimtools.com/db/search?query=Tome of the Arcane Wastes) ([Purified Salt](http://www.grimtools.com/db/search?query=Purified Salt) / [Creed’s Cunning (Black Legion)](http://www.grimtools.com/db/search?query=Creed’s Cunning))
Hands: [Light’s Defender Gauntlets](http://www.grimtools.com/db/search?query=Light’s Defender Gauntlets) ([Unholy Inscription](http://www.grimtools.com/db/search?query=Unholy Inscription) / [Mogdrogen’s Touch (Devil’s Crossing)](http://www.grimtools.com/db/search?query=Mogdrogen’s Touch))
Waist: [Ulzuin’s Torment](http://www.grimtools.com/db/search?query=Ulzuin’s Torment) ([Antivenom Salve](http://www.grimtools.com/db/search?query=Antivenom Salve) / [Mogdrogen’s Touch (Devil’s Crossing)](http://www.grimtools.com/db/search?query=Mogdrogen’s Touch))
Legs: [Empowered Legplates of Valor](http://www.grimtools.com/db/search?query=Empowered Legplates of Valor) ([Scaled Hide](http://www.grimtools.com/db/search?query=Scaled Hide) / [Outcast’s Warding Powder (Outcasts)](http://www.grimtools.com/db/search?query=Outcast’s Warding Powder))
Feet: [Golemborn Greaves](http://www.grimtools.com/db/search?query=Golemborn Greaves) ([Antivenom Salve](http://www.grimtools.com/db/search?query=Antivenom Salve) / [Mogdrogen’s Touch (Devil’s Crossing)](http://www.grimtools.com/db/search?query=Mogdrogen’s Touch))
Amulet: [The Peerless Eye of Beronath](http://www.grimtools.com/db/search?query=The Peerless Eye of Beronath) ([Focusing Prism](http://www.grimtools.com/db/search?query=Focusing Prism) / [Survivor’s Ingenuity (Devil’s Crossing)](http://www.grimtools.com/db/search?query=Survivor’s Ingenuity))
Rings: [Invoker’s Shocking Touch](http://www.grimtools.com/db/search?query=Invoker’s Shocking Touch) ([Corpse Dust](http://www.grimtools.com/db/search?query=Corpse Dust) / [Kymon’s Vision (Kymon’s Chosen)](http://www.grimtools.com/db/search?query=Kymon’s Vision))
Rings: [Invoker’s Burning Hand](http://www.grimtools.com/db/search?query=Invoker’s Burning Hand) ([Corpse Dust](http://www.grimtools.com/db/search?query=Corpse Dust) / [Kymon’s Vision (Kymon’s Chosen)](http://www.grimtools.com/db/search?query=Kymon’s Vision))
Medal: [Mark of Divinity](http://www.grimtools.com/db/search?query=Mark of Divinity) ([Arcane Spark](http://www.grimtools.com/db/search?query=Arcane Spark))
Relic: [Ulzuin’s Pyroclasm](http://www.grimtools.com/db/search?query=Ulzuin’s Pyroclasm)
Click here to view equipment configuration
In closing
Since release of crucible dlc and due to its nature AoE capabilities and specially tankines of the builds became much more important than single target dmg output. That resulted in shifting meta to tanky builds specially S&B soldier incorporated physical dmg builds. But due to latest nerfs, I will be free to say, to most melee builds meta largely shifted in casters/hybrid casters direction.
There is not even single melee build left that can measure with casters/hybrid casters in overall performances (crucible and vanilla game included).
Ofc there are still some melee builds that, when it comes to single target dmg output, outdps casters but not for much and when you look at overall performances of those builds they are lacking in tankines or AoE or in most cases both.
This build is template of tanky caster with superb AoE and decent single target dmg output and its giving you the freedom to build it to your liking w/o losing much of its performances. So feel free to experiment with adding some other skills like devastation, TSS or even BWC to it. Also you can try with different classes combos ie elementalist, warlock or druid, you just cant build it wrong and it will be functional no mater what.
Welcome to new GD casters meta!
AoM update
Since I got some nice gear from reacent farming runs its time to update a bit this fella.
In original post I mentioned that you could take w/e skill you want to supplement obliteration and that I picked up grenado, well for this update and AoM expansion I decided to pick up other skill, this time picked skill is Devastation.
WTF fire/aether based skill with elemental electrocute obliteration?
Yes, boys and girls, game had moved on and is giving you much more dmg conversion possibilities that it was back in time when this build was made.
With some nice items we are now converting all aether and part of fire dmg in lightning.
It looks like this:
Constant auras, Obliteration on RMB

Constant auras Devastation on RMB

You can move around some components to get more cast speed and thus more dps, but I felt that armor is, in this case, much more needed cuz build doesn’t shine in that aspect and dont have to much phys resistance.
As mentioned earlier this build converts all aether and part of fire dmg to lightning. Conversion is achieved with following items:
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2x Invokers shocking touch, mythical or non mythical it doesn’t matter much until they have some decently rolled conversion %. I have one mythical and one non mythical one.
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Aether storm amulet same story as with rings. I have mythical.
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Temporal tempest dagger again, like with rings. I have mythical one.
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Cindertouch try to get one with highest possible conversion fire to lightning, mines are 29%.
Dont do this build if you dont have first 3 listed items, you can be ok w/o Cindertouch, but first 3 are must imho. Also try to combine them to achieve 100% aether to lightning conversion.
Grim tools: http://www.grimtools.com/calc/O2GW19n2
I didnt tested this build in cruci, but with CDR it provides it shouldn’t be to hard to finish gladiator, tho tankines of this build is not on the level of triple devastation/BWC sorc, but it has more dps.
Other than that I facetanked Alex and took down Kupa few times with little to no issues, tho Kupa is not facetankable.
Have fun 
Peace out!