Mysterious Double Saber Camo

What is this DS camo and where is it from? I found it for sale but it doesn't have a name or description.pso20200806_023432_000.jpg It folds into cool "wings" when sheathed and it rests on your upper back.

It appears to be one of the possible post-match rewards from the Battle Arena.

@AndrlCh Thanks for the answer!