What motif is this?

olsborg · May 2019

https://cdn.discordapp.com/attachments/553864583341670401/580513911237902357/unknown.png

Edaphon · May 2019

It's the Necromancer costume that was datamined some time ago. I'm not sure if the helmet is part of it or not.

No idea when and where we can get it.

Edit: it's also used in some of the promotional art:

therift · May 2019

The Shroud of the Lich set closely resembles the image ( or at least the hat)

olsborg · May 2019

Thanks @Edaphon