It can start your Melee Chain, now Ranged. Does not replace.

First, "Where do we get it?".
For Elyos, you get it from Aethergenetics Lab in Heiron.
For Asmodians, you get it from Alquimia Research Center in Beluslan.

And now, Slashing/Punishing Wind (Gonna just call it 'Wind' now) is a instant Nuke that starts the Heaven's Judgement and Divine Touch Chain. You can learn them at 42. Some key notes:
1) Wind and Hallowed Strike resets CD for both, whichever is used.
2) Wind is instant and Range, Hallowed Instant and Melee.
3) Wind has a 16sec CD, Hallowed has a 8sec CD.

Now, Wind has the potential to do more damage, but if you need to Spike someone, run in after 8secs and do your
Hallowed Chain. You should do your Hallowed Chain when you're confronted with a Melee too (when Wind is on CD) to lower their Attack Speed and possible Stun.

In conclusion, the key thing is the different CDs and they both trigger each others. This can make the difference between letting someone get away, and you killing them. Note as well, Wind does not lower their Attack Speed.

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