Now that you're ready to move on to the next tier of gathering, you will be spending most of your time in Eltnen.  Unfortunately, as you will likely find, the rifts don't always allow for unhindered gathering and you will become the victim of the occasional band of Asmodians who have come through looking for easy targets.  The best way to avoid unwanted PvP action while you're trying to level your vitality extraction skill is by taking the time to travel to Theobomos for vitality leveling.  There are less gathering node types to choose from, but you won't have to watch your back every second either.

A couple of nodes to pay particular attention to are the Umblia and Omblic nodes.  Umblia, an alchemy material, sells steadily on the broker and Omblic drops the rare Omblic Petal that dyes armor the popular red color.  If you are hurting for kinah, it's a good idea to gather from these nodes whenever possible for resale.

Material Collecting

Aether Extracting

There are quite a few varied level vortexes above Eltnen Fortress.  They might be hard to find though because they are popular and frequently in use.  At levels 100-150, I'd stick with the vortexes that are surrounding the transportation platform.  The rings and floating island make great landing spots to go back and forth.  You can also land on the cliffs above the fortress and manage to stay pretty close to a few vortex nodes.  There is a vine that sticks out of the southeast side of the cliffs above the fortress that is a usable distance from a couple of 175 nodes.

Gathering from these nodes works a lot better during off hours, either later at night or during the day so if you have free time during these hours, use them to gather aether!