From Arwic run to the Arwic Mines portal at 33.8N, 56.8E.
From the drop go through the door and take the first right into the room with the NPC vendor Elthina the Shady.
From this room, take the passage on the north wall and head down the ramp.
Continue east through the intersection and head down another ramp. From here, you can just keep left all the way down to the Banderling room.
You will go through a door and then a few rooms filled with Banderlings. When you head through the door to your east, you'll be at a split. Keep left and go through the winding corridor until you reach the ramp down.
Keep to the left until you come to a locked door (diff. 40). Pick it open, then continue left until you reach a large room with Banderlings and a Lich.
Another locked door is on the west wall (diff. 122). Pick it open, in the middle of this room is an area with Banderling Bandits and a Banderling Striker near two chests.
The third and the most difficult camp is now inhabited by higher level Banderling including a Banderling Rogue which drops the Fire Spear.
Updated during the Reforging the Past event, the Edelbar camp can now be accessed and completed through the Facility Hub Quests for an experience reward. The Quarter Staff of Fire has also received an update.