How to get this ear TF?

[razor777]

https://imgur.com/CrcWoDz

I would assume the au ronce version of sylvanol to be the way to get this, but the wiki doesn't mention anything of the sort.

Is it a real obtainable ear TF, or is it like a case of something that was made but never used?

 

[Theron]

Dark Sylvan isn't in the list of Valid Ear Types and doesn't have an ear description, not even one shared with Sylvan. It probably shouldn't be in that list.

In fact, it only has a Wing description.