The Prowling Demons, also known as the Titanite Demons, are demons born from the scattered legendary slabs after the unnamed blacksmith deity passed away. They wield the Titanite Catch Pole which still has residual power from the Titanite Slab from which they are spawned.
They act as minibosses in various areas in Lordran, but all of them can be avoided or run past. New players will struggle with them, so for them, not engaging them is advisable.