Baldur's Gate : The Sword Coast Chronicles : NWN2 Persistent World

You can pick Praticed Invoker, and it should give you additional +2d6 Eldritch Blast, which means that you can actually get Eldritch Master for +50% Eldricth Blast damage.

It is not necessary, but it gives more damage with just two feats.

This build sounds awesome. I may fool around with this idea. Thanks guys.