His level 20 talent of lightening breath 200% duration increase is wasteful and not needed , normally you don’t make use of it.
I suggest changing the talent into this:
Increase lightening breath duration by 100% and increase it’s range by 40% plus increasing it’s slow and damage by 10%.
I miss his old lvl 20 talent that increased the length of it. I have never been in a fight were i would stand still that long just so people could get a free kill on me by standing behind me.
Yeah I never pick it myself. . But the increased range made sense back when it didn’t slow. Right now I think it would kill any squishy if it had extra range.
It’s a good talent and can win games, you just gotta know when to pick it.
One situation could be Infernal Shrines. You want to secure the punisher and win with it? Hellstorm is there for that.
Team is going to core and you want fast damage to end the game? Hellstorm!
One last fight over a boss that can end the game? Hellstorm!
And there’s many more…
It’s a pretty powerful zoning ability, CC and damage, especially with W build.
And you stand still for 12 seconds ? That’s probably your demise , it can be useful in rare situations , I want it to be useful in much more situations
Yes, you stand still zoning for 12 seconds while the enemy can do nothing to you or you just melt them 
Btw, even in HGC players took this talent, so it’s definitely not bad and has its uses.
Can you not cancel it if you are getting focused on?
This would be way too strong.
Yes you can. Once, I pressed it 2 times too fast and just canceled it lmao.
They took back when the ability has 60 seconds cooldown , normally you won’t be hitting a lot of enemies because they will be spread out , and you will get focused and forced to cancel it thus not utilizing the benefit from level 20 talent.
8 seconds increase is an over kill
Depends on how and when you use it. You can always just use spell shield with it to soak the damage they throw at you at first, and by the time the spell shield is off they already took all the damage.
It’s also pretty amazing tool to zone people out of things, and because you are usually using LB to combo with other abilities/heroes, they take a lot of damage if they want to step up and do damage to you.
Plus you are level 20, with 100 souls you’re basically unkillable.
I love Hellstorm with the W build, and if you pair it with Anduin, Tyrael, or Lucio, it basically becomes “You are not allowed to go here.” Often just the threat of turning on the demonic halitosis is enough to zone an enemy, without even having to use it. Although I prefer Hellgate as a general talent at 20, Hellstorm definitely has its place.