I am confused with all this Essentials and Core 4E stuff. A friend of mine is trying to make an Assassin via the Dragon Magazine #379. But what's the deal with the Executioner Assassin in Heroes of Shadow? Our assumption is that all the classes features are already picked out, there's no real customization. For example, we don't see a 1st-level Daily power anywhere. What are the differences between a Core Class and an Essential Class? It looks to use like the Essential Classes are unable to optimize except through feats.