You will need to kill Sun-Talon Oberyx in order to obtain . The arakkoa is located underground, the entrance to which is located on the left side of the path heading southwest to Veil Terokk from Crow's Crook. If you see the The Eye of AnzuTerokkar Wayshrine, then you've traveled too far.
The only ability to watch out for is Oberyx's . Start moving away from where it will land - where you currently are standing - once Oberyx begins casting it. Don't worry about running out of ground room; only two electrified chakram may be active at a time. Electrified Chakram