Slipstream is an air buff ability. Surround yourself in a veil of air, increasing your movement speed.
At level I, you have a basic speed boost. Level II increases your jumping height. When you're level III, you intermittently become invisible and increase the power of the buffs. Level 4 Path 1: Divine Breeze- Become stronger in melee and airbending combat. Level 4 Path 2: Run like the wind- Become invisible more often and potion effects are stronger