Purple Shadow Cobra

There is one tameable creature with this look.

Purple Shadow Cobra
Upcoming Pet
<Loa of Treachery>
Dusky Grotto, Ardenweald
Retains its original name after taming.
Found during the Night Fae-only quest "Cleansing the Forest".
* Level scaling: In Shadowlands most NPCs will scale with the Hunter's level, within the constraints of their level range. Hunters can tame regular NPCs up to 2 levels higher than them, but can only tame elite NPCs of the hunter's level or below.