Welcome to my Valla guide! I'll teach you the basics of learning and playing Valla; She is a high mobility ranged assassin that has a strong team fight, damage, and escape, currently she is one of the strongest Heroes to play. As I have said she has a good team fight and with her Tumble she is good at avoiding focus, though a heavy CC team will shut her down (as with most Ranged Assassins or Assassins in general).

A Little About Me: Hi! I'm Kalaaver, and I'm a big League of Legends player and have Achieved some decent success there as I reached the Platinum Tier. I was excited to get into Heroes of the Storm and I was hopeful it would be different from other's MOBAs while keeping the basics. Well Blizzard nailed it and it has been one of the only MOBAs besides League to hold my interest and I plan on playing it for a long time.
No other MOBA held my interest besides League, Smite was fun, but I only play it now and then, didn't enjoy Dota 2 all that much and everything else is a carbon copy of League/Dota. But this game has hit a home run on the most important thing...addicting fun gameplay!

About Valla/Background: Valla, the Demon Hunter, is an assassin hero from the Diablo franchise. She witnessed the ferocity of hellspawn firsthand as the demons ravaged her village and left her for dead. Now, with no people to call her own, her only allegiance is to her cause: to rid Sanctuary of the demonic filth corrupting its lands.

Valla strikes at her enemies from afar and gains hatred, increasing her move speed and basic attack damage. She can vault away if enemies get too close.

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Hungering Arrow - Fire an arrow that deals 366 (81 + 15 per level) damage to the first target hit, then seeks up to 2 additional enemies dealing 183 (40.5 + 7.5 per level) damage. Can hit an enemy multiple times.

Cost: 60 Mana
Skillshot
Cooldown: 14 Seconds
[Q] Ability

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Multishot - Deal 360 (75 + 15 per level) damage to enemies within the target area.
Spans 45 degrees.

Cost: 60 Mana
Cone Skillshot
Cooldown: 8 Seconds
[W] Ability

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Vault - Dash to the target area.
Has a duration of 0.3 seconds. Dashes around obstacles as the move command does. Issues a move command to the target after Vault expires.

Cost: 75 Mana
Cooldown: 10 Seconds
[E] Ability

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Rain of Vengeance - Launch 2 waves of Shadow Beasts that deal 560 (123 + 23 per level) damage to enemies within the target area, stunning for 0.5 seconds per wave.
Has a delay of 0.6 seconds. Strikes once every 2 seconds. Each wave lasts 0.4 seconds. Entire ability ends 3 seconds after cast.

Cost: 100 Mana
Heroic Ability
Cooldown: 90 Seconds
[R] Ability

Pros

+ Great Damage + Decent Escape + Strong Team Fight CC + High Mobility

Valla has some of the best damage in the game currently, she has good early damage and poke. Her Rain of Vengeance makes her a good team fighter and her Vault is good for dodging enemy ability's and escaping, Vault also makes for good chase when those low health enemy's are trying to escape. Valla is also a good duelist and can take on "most" other Ranged Assassins 1 on 1.

Cons

+ Squishy + Weak Vs Heavy CC + High Priority Target + Ability's Fall Off

Though Valla has strong poke, that ability damage falls off a bit during the later game, not to say her ability's are rendered useless but you will be using them less with the exception of your ult which you will be using more during team fights. Now dishing out tons of damage for your team is great and all remember that it makes you a high priority target, and vs heavy CC it can be tuff for Valla, even with her Vault.

The Early laning phase is all about poking with ability's and harassing with auto attacks. You want to push your lane hard and deal as much siege damage as possible, because of her damage and AS she can push the first base quickly. Once you have pushed that down, join your team and get mercenary camps. If you are the one getting harassed and poked, you will have to play passively and stay by your turrets. If the enemy is ganking your lane often do not push the lane or you will just feed the enemy team.
Team fights are all about staying behind your tanks and being aware of your position. Think about the enemy's heroes and their ability's, again be aware of your position if one hero is near you and has long ranged poke you need to be aware of that and be ready to Vault to dodge. The other part of team fighting with Valla is using the ult of yours, when the enemy clumps up you hit your Rain of Vengeance. Again be aware of your position, its easy to get locked down by CC or pulled in and be melted in seconds.
Now late game is even more about positioning and being aware of where you are in a team fight then before. Because if you get caught or someone hits some CC on you it could end the game for your team, especially with 50 to 60 second death timers. Winning late game fights are critical to gaining the upper hand and considering you are probably one of the higher damage heroes on your team you want to be alive to help carry the fight. I'm going to repeat this for the millionth time because it's important, be aware of yourself and the enemy's around you, understand their ability's. Focus on keeping a distance from long range poke or CC heroes, and deal damage from the back at a distance. Look for opportunity's to ult as many of the enemy as possible when they group/clump.
Well that ends my guide, I will continue to update the guide. I hope this helps people who want to learn Valla, so go out there and have fun! Feel free to leave your opnion and thoughts in the comments, thank you and good luck!