Voidwall>vortex plus nightstalker is the best pvp and pve subclass for hunters
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Right now I think the warlocks are at the top by a little. With improved energy drain, firebolts being a thing, and stormtrance it has the best overall array of subclasses. It has a class with a good super but also 2 classes with elite neutral games. But that's just my opinion.
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If you throw it on flat ground it spreads out perpendicular to the direction you threw it. So if you throw it in front of a corner for example it would spread out in the direction around the corner blocking the path. You are probably throwing at a wall and then it spreads out randomly when it falls to the ground.