The hooded shroud of spookiness was an item from an EM event on Siege. It is a hat of magi white hued hooded shroud. To my knowledge, there were only a few dropped during the event in one evening.
You can just barely see Ibichi wearing one of the shrouds in the center of this pic at a player run trick or treat event.
I understand wanting to have them blessable but, having a special turn in item to bless them would affect like 4 people in the game.
Since there are so few of the items it would be nice if they could be manually tweaked to allow a CBD to be applied but I doubt that will happen. Siege bless works on it as far as I know though.
-Skylark