In that context I would say that it is a no go. Humans are able to pick up powers from their class that normally they couldn't (like with warlocks who normally only get eldritch blast and a power or two from their pact) so being able to pick up that power is legit. Essentials characters are class types that gives up certain class features that are normal for their class in exchange for different ones, so as a result your character cannot benefit from a feature he doesn't actually have so just ignore that part of the power.




