I'm actually confused about this thing. You see in Y1 I thought Agility mainly affected your Movement speed and your intial vertical jump (This hardly ever came into play with anything but It's in the description so I included it) but recently I've been hearing people say it Agility has nothing to do with your sprint speed which leaves me with 2 questions.
What is agility supposed to do and if it doesn't have anything to do with your sprint speed why does it increase it the more you spec for it? I'm super confused right now lol.
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It doesn't affect sprint speed. It affects all of the other on-ground movement, though. The only class perks that will make you run faster are on Nightstalker and Bladedancer.