The Dawn Wanderer is a monster from The World which must be killed to bring back Mia. The player must also kill the Temptress Lover when it was in Macha / Cat Form.
The World R:XEdit
A Dawn Wanderer makes an appearance in the .hack//Sign timeline in .hack//Link. Tokio and Tsukasa (Link) fought against it and won. Then, Macha (Link) let herself get data drained by it, then Morganna(Link) says something.
Later on a second Dawn Wanderer is fought and again Tokio and Tsukasa won the fight.