The only changes Windwall Needs
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Fix the size (no longer grows in size with rank) to be the size of live rank 2 or 3.
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Reduce and make duration scale with Level. 1/1.25/1.50/1.75/2 seconds.
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Have the wall Spawn at his auto range, reduce drift so that it ends in about the same spot.
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Compensate with a SLIGHTLY lower cooldown. (nothing major, 2 to 4 seconds at max rank is all I was thinking tops)
What this does: Makes windwall a more skill expressive ability (can't block by throwing wall in opposite direction, and have to react a bit sooner since it doesn't spawn in your hit box), With less zoning capabilities till late game (since its his last skill maxed) and even late game the duration should feel less oppressive as its almost 1/2 of live duration (3.75 seconds).