Over-Land Breathing Devices are gadgets that allow breathing above the water for underwater creatures, such as the Barraki of the League of Six Kingdoms.
The Ko-Matoran scientist Jumble first invented the over-land breathing devices by making it collect water molecules in the air and store them in the gadgets. He sold it and became wealthy, for many sea creatures bought and used it.
Many sea creatures have used these breathers, among them the Barraki warlords. The warlord known as Ehlek of the League of Six Kingdoms led his army to the overworld with these breathers to fight Conqueror in the the Battle of the Army of Conqueror and the Kingdom of Ehlek.