NSDictionary *skillsDictionary = json[@"skills"];
    if ([skillsDictionary isKindOfClass:[NSDictionary class]]) {
        NSArray *activeArray = skillsDictionary[@"active"];
        NSArray *passiveArray = skillsDictionary[@"passive"];

        NSMutableArray *mutActives = [NSMutableArray array];
        NSMutableArray *mutPassives = [NSMutableArray array];

        if ([activeArray isKindOfClass:[NSArray class]]) {
            [activeArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
                if ([obj isKindOfClass:[NSDictionary class]]) {
                    NSDictionary *activeJSON = (NSDictionary*)obj;
                    D3Skill *skill = [D3Skill activeSkillFromJSON:activeJSON];
                    if (skill) {
                        [mutActives addObject:skill];
                    }
                }
            }];
        }

        if ([passiveArray isKindOfClass:[NSArray class]]) {
            [passiveArray enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
                if ([obj isKindOfClass:[NSDictionary class]]) {
                    NSDictionary *passiveJSON = (NSDictionary*)obj;
                    D3Skill *skill = [D3Skill passiveSkillFromJSON:passiveJSON];
                    if (skill) {
                        [mutPassives addObject:skill];
                    }
                }
            }];
        }

        self.activeSkills = mutActives;
        self.passiveSkills = mutPassives;
    }

NSString *responseJSONasString = [fetchRequest responseString];
NSDictionary *itemResponseArray = [responseJSONasString JSONValue];

NSArray *heroes = [itemResponseArray objectForKey:@"heroes"];
NSDictionary *firstHero = [heroes objectAtIndex:0];
NSString *heroName = [firstHero objectForKey:"name"];