The transmog helm
Dark Ranger's Hood can be obtained in the Hunter class hall after completing a short questline.
Step One: Speak to
Death Hunter Moorgoth and buy 13
Black Roses from him.
Step Two: Afterwards, find
Dark Ranger Velonara, give her the roses, and then return to
Death Hunter Moorgoth.
Next time you see
Dark Ranger Velonara, take the quest
Dark Memento and follow it back to
Death Hunter Moorgoth who will then have
Dark Ranger's Hood for sale!