npc_dota_hero_storm_spirit_guide

Skill Build

    Static Remnant
    Overload
    Electric Vortex
    Electric Vortex
    Electric Vortex
    Ball Lightning
    Electric Vortex
    Whatever you like after this...

The idea here is to get the longest stun you can as fast as you can. Generally speaking you should always get your Ultimate (4th ability) as soon as you can each time you can.
Start of Game Items
We'll start with some stats for survivability, and then upgrade those items into more active items we'll use to survive.

    Consumables -> 2 Tangos (This item has 3 charges per tango, and will regen health. To use it, first click the tango, then click on a tree to absorb it)
    Consumables -> 1 Clarity Potion (This item regens mana. Use it by simply clicking on it. However if you take any damage while using it, it will stop)
    Attribute Boosts -> 1 Gauntlet of Strenth (This gives you +3 Strength which will boost your health)
    Attribute Boosts -> 1 Mantle of Intelligence(This gives you +3 Intelligence which will boost your dmg and mana regen a little)
    Attribute Boosts -> 1 Ironwood Branch (This gives you +1 to all your stats which is always good at the beginning of the game when everyone is so fragile.)

Mid Game Items
We'll complete our healing item and start doing more damage.

    Miscellaneous -> Boots of Speed $500 (Its important for Sven to be able to move quickly in and out of fights to maximize the stun time, and to chase enemies)
    Miscellaneous -> Magic Stick $200 (Gains a 1 charge every time an enemy near you casts a spell. You then use the item to gain 15 health and mana per charge stored. You must click this item to use it)
    Attribute Boosts -> 2 Ironwood Branch $53 each(This gives you +1 to all your stats which is always good at the beginning of the game when everyone is so fragile.)
    Recipe:Basics -> Magic Wand $150 (Will collapse the 3 ironwoods and your magic stick into 1 item to free up space)
    Attribute Boosts -> 1 Circlet $185 (+2 to all stats)
    Recipe:Basics -> Bracer $175(compresses your Gauntlet and Circlet into 1 item to free up space)
    Attribute Boosts -> 1 Circlet $185 (+2 to all stats)
    Recipe:Basics -> Null Talisman $175(compresses your Mantle and Circlet into 1 item to free up space)

Now we'll boost our stats so we can use our ultimate as often as possible and survive fighting up close with a BloodStone. BloodStones also come with a lot of cool other bonuses that you should go to the playdota site or go to the end of this guide. First we'll make Perseverence

    Secret Shop -> Void Stone $875 (boosts mana regen by 100%. Great for Int heros.)
    Secret Shop -> Ring of Health $875 (+5 health regen)

Now we'll make a Soul Booster, which will complete the BloodStone.

    Secret Shop -> Point Booster $1200 (+200 HP, +150 mana)
    Secret Shop -> Vitality Booster $1100 (+250 HP)
    Secret Shop -> Energy Booster $1100 (+250 mana)

Late Game Items
This is really up to you and how the game is going.

    Want more Defense? Try Shiva's Gaurd.
    Want more Damage? Go for Eye of Skadi which will slow people too.
    Want to disable? Get a Sheepstick

Bloodstone

    Bloodstone gains 1 charge each time an enemy hero dies in 1000 AoE
    Each charge gives 1 Mana regeneration per second
    When the bearer dies, Bloodpact restores 400 + 25 per charge HP to allied units in 1700 range, and Bloodstone loses half its charges (rounded down)
    While dead, the bearer gains 1800/1800 AoE vision at the location of death, and gains experience in 1000 AoE at that location
    Gold lost on death is reduced by 25 per charge
    Respawn time is reduced by 3 seconds per charge
    Bloodpact only functions for the highest priority Bloodstone in the inventory