Wind Skimmer is a 
Jakobs Sniper.
Its special effect is Higher Ground - Shot cost reduced to 1 while in the air.
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How to Unlock The Legendary Wind Skimmer Sniper Rifle
Weapons
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the Bounty Pack 5: Amara and the Vile Shadows DLC until reaching the Optional Boss Hybrid Thresher.
Farm Method:
- Defeat Hybrid Thresher to get a chance at the Wind Skimmer.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Hybrid Thresher until the Wind Skimmer drops.