Dark Angels Baton is obtained by killing Jainus Une Roha found in the third level of Rahkon.
The Baton normally drops when he is killed. The Baton is considered to be a Healer or Mage class item. Since the Dark Angels Baton is a blue named item, it cannot be traded in-game. It can only be traded through the exchange market. It is highly recommended any party's killing Jainus Une Roha to set the party's distribution to "Free" and have any healers or mages obtain the item.