Hitting level 50 isn’t the only step required to get into raiding. Heck, it’s not even just about getting right gear. Wildstar has a host of requirements before that’s possible. See the images below:
Here is an image of the vendor where you buy the attunement key:
Also, dear readers, if you happen to come across a handy infographic like this that is tailored to the exiles, feel free to drop it in the comments. Enjoy.