So Tempest Strike that focuses on spell damage, triggering the Lightning Tempest and Storm Bolts, perhaps with Crows or Storm Totem. There are some questions to answer:
Storm Bolts
There’s only one node that procs Storm Bolt and that’s Sky Opener, and it says that you expend Storm Stacks when you use Tempest. So the question is, how do you get Storm Stacks to expend?
The only option I know would be using Storm Breaker and the node that makes your minions generate stacks. But that weapon is very bad, plus we don’t want to actually use Gathering Storm, because we use Tempest Strike.
What’s more, the node in Tempest Strike is locked behind another node that increases mana cost, which is not great. This + the fact that Tempest Strike is VERY skill point hungry, I would recommend to forget proccing Storm Bolts with attacks completely.
If you absolutely must have Storm Bolts, we can still have them proc from using Maelstrom.
Tempest Strike
So the skill tree could look something like this:
Basically we take all the +% more damage nodes that apply to spells (aka. they do NOT say “melee”), we take bonus spelldmg with 2h weapon, we disable the wind and cold tempests and get -16 mana cost reduction and attack speed. Now it costs 0 mana, so we don’t take the +5 mana on hit node.
Tempest Strike works like a combo, basically you HIT, HIT, TEMPEST, so you get two melee attacks and then one aoe lightning. This happens fast, with this setup you’re pretty close to 3 attacks per second.
There is a node in the top left that gives a chance to proc TEMPEST on the other two hits, but it’s only 40% chance, and it costs 4 points + 2 points for the prerequisite node that only adds shock chance. Those nodes look REALLY BAD on paper, but Thunder Tempest is basically our main attack right, so I guess it remains to test it and see what works better. In that case, I would take away 4 points from Heorot’s Arsenal and 2pts Windfury Force, like this:
In both cases, we get extra spell damage from helmet with this prefix: Spell Damage with Tempest Strike.
Thunder Tempest is a Lightning Spell and also scales with STR and ATN, so the stats to look for are:
- % increased Spell Damage
- % increased Lightning Damage
- % increased Elemental Damage
- % increased Spell Crit Chance
- % increased Crit Chance
- % increased Attack Speed (because we proc it with melee attacks)
Minions
Now minions (both Crows and Totems) don’t scale with our spell damage, so going for both would mean it’s a hybrid build, and powering up one side of things will weaken the other.
Luckily both Crows and Totems can be useful as support minions too.
- Storm Crows are always a good addition. They can buff your spell damage, apply Shock and Armor Shred debuffs to enemies, and if you specialize into it, you can use their ability as a Teleport skill.
- Another option would be Summon Spriggan (in Druid skills), it is available to all masteries, and provides an aura that regenerates HP, adds spell damage (roughly the same amount as Crows), but also adds flat % Crit Chance and % Crit Avoidance. The downside is that Spriggan can’t apply Shock or Armor Shred
For Totems, there is also a choice.
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Storm Totem requires we play as Shaman. The Totem itself can deal pretty good damage, it has good nodes that allow us to max its Crit Chance even without specializing into minions very much - ideal for this build.
The buffs it provides are: +45% increased Lightning damage and up to +40% movement speed when it hits a shocked enemy. It also applies Shock itself.
And as cheery on top, Storm Totem can cast Storm Bolts instead of its normal lightning. I’m not sure how exactly this works, I assume it takes the Storm Totem’s spell damage, cast speed, crit and %increased dmg stats, and then applies the bonuses from both skill trees of Gathering Storm and the Storm Totem. PS: and it has a synergy with Tempest Strike - when you proc the Thunder Tempest, it also procs around your totem. So Summon Totem → proc Tempest → double hit?
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The other choice is Summon Frenzy Totem from Beastmaster. This totem gives Attack Speed in the form of Frenzy buff, but it can also give % More damage, % Crit multi and these two stats are way more powerful than the buffs from Storm Totem, but Frenzy Totem deals no damage on its own.
Maelstrom + Warcry
This combo is used by many Primalist builds.
- Basically you set Warcry on autocast with the numlock trick, this heals you, cleanses you of debuffs, and grants you +200% increased Crit chance and +4 stacks of Maelstrom, this happens everytime you use it.
- Maelstrom is then specialized to grant Haste and Frenzy buffs at 6+ stacks of Maelstrom, and Warcry is fast enough to keep it permanently active. In your case, you can also take Power of the Storm node to proc Storm Bolts every second, on up to 4 targets, and finally you can also use it to boost your Stun Chance.
This requires two specialized skills, so there would be no room for both Crows and the Totem.
Since Gathering Storm will not actually sit on our skill bar, you can still have both Crows and Totem, just one of them will be unspecialized. However you also want a slot for traversal skill, the Fury Leap, to move around faster. Choices, choices 
but I’m directly casting the Tornadoes, no Tempest Strike.