Megadroid

The mysterious, enormous mechanical beings called Megadroids were a race of explorers who discovered Nexus in ancient times. All available evidence indicates this expedition was completely destroyed by Eldan Annihilator constructs within weeks of their arrival on the forbidden planet, and no living examples of the Megadroids have ever been encountered elsewhere in the galaxy. What little is known of their history, including their name for themselves, has been construed from their own decaying databanks and circumstantial Eldan records, but so far their planet and even galaxy of origin remains a mystery. They are believe extinct.

Physical description
Although few intact Megadroid chassis have been found, even partial discoveries indicate they were all similar in size ans structure - around fifty meters in height, with humanoid bipedal bodies and roughly humanoid "faces" formed by various sensors and communication apparatuses. It is widely believed they differentiated themselves via energy signatures and internal sensors rather than appearance.