http://prntscr.com/6rqit3

Any idea why is this happening? I'm a warlock worgen, I meet the requirements, yet I can't use it. I'd appreciate a fast reply as I have 2 hours before I can hand it over to a guildie if I won't be able to definitely use it.

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Okay, I've figured out the issue. Apparently, you can't be in your garrison to use the essence, which is somewhat weird. As soon as I left Lunarfall I was able to get the quest from the Essence. In the end, if you have the same issue as I had, just leave your garrison. I'm terribly sorry for a double post, but I was on a clock and I needed immediate help.

To any moderators reading this thread, you can close this one and delete the other. Thanks a lot!