Impetusium has two different types of "Big Vortexs" Here, much like Altgard. The ones that take skill level 50 to gather are much closer to the ground then the ones that take 75 to gather. The upside here is there is MANY different places to land and wait for your Flight Timer to cooldown, where as Altgard didn't have quite as many. Below is a picture of all the locations:

           When your skill reaches 75 you will nee

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           The Small Vortex's all the way up top will take you to 99. Once your skill reaches 99 you will want to return to Pandaemonium and purchase the next rank of Aether Extraction.

NOTE: The most common places to find the Small Vortex's that take 75 skill to harvest is right around the pillars sticking out of the Impetsium.