Have been going to E-Rock for years and love it.  One caution.

To newbies hiking to the top of E-Rock at night, it's easy to become directionally disoriented one you reach the summit.   After dark, there aren't too many visible landmarks and few landmark-worthy lights in the distance to navigate by.  Hence, take a compass and use it to locate the correct direction down.  You don't have to be too precise.  Take a general directional bearing on the way up and follow the opposite bearing to go down.  This will point you generally in the direction of your ascent.  Otherwise, you could be suprised to find yourself on a much steeper descent that you expected.