Doradus

The legendary lost city of Doradus lies somewhere on Cybertron. It's said that this mythical realm is home to the Fountain of Energon, which grants whoever may find it with eternal power. It may possibly be protected by malevolent spirits.

Fiction

2015 Robots in Disguise cartoon

The Decepticon Springload was obsessed with finding the lost city of Doradus, even to the point that he was oblivious to the fact that he was searching for it on the wrong planet. Bumblebee and Strongarm tricked him by impersonating spirits from Doradus so they could capture him. Rumble in the Jungle