Mignah Cahru  

where do you get the acrylia for the slate?

If you use find she is also near Melee Augments-Gemcrafter Solus. Both are upstairs.

For those having trouble finding this guy, I know I have, ask one of the guards, they'll tell you he's near the north gate above the tails tavern. When you reach the gate go into the first building on the east, should see a vah shir female named Jharin Taani, go upstairs and there you'll find Mignah.