I must protest that any hooded figure or shady character is not allowed to pass.
I am Asthileh, and I wear black robes with grey trim and have green eyes. I have fought and killed a Necromancer before, speak to Redbain about that. I find it a bit pretentious for you to say I cannot pass, simply because I prefer to be hidden at night.
Also, what use is a wall to an Undead who can fly?