Windrunner's Second Surge

[MistbornAlpaca he/him]

I feel like I should know the answer to this, but I don't, so, here goes. What is the other Windrunner surge, after gravity? 

[notsawerd]

Adhesion (airpressure and vacuum)

[Weltall]

For future reference, here's an annotated version of the chart that comes in the Way of Kings with all the Orders and Surges labeled. Makes it easy to see who gets what at a glance.